{"id":91739,"date":"2023-05-31T18:00:00","date_gmt":"2023-05-31T21:00:00","guid":{"rendered":"https:\/\/vestibulares.estrategia.com\/portal\/?p=91739"},"modified":"2023-06-01T11:38:22","modified_gmt":"2023-06-01T14:38:22","slug":"lei-de-hess","status":"publish","type":"post","link":"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/lei-de-hess\/","title":{"rendered":"Lei de Hess: o que \u00e9, entalpia e quest\u00f5es resolvidas"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A <span id=\"urn:enhancement-c84d0b52-74e0-4135-a622-ddfe805e3e80\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termoquimica\">termoqu&iacute;mica<\/span> &eacute; a &aacute;rea de conhecimento que estuda as rea&ccedil;&otilde;es qu&iacute;micas e as energias relacionadas com elas, do ponto de vista t&eacute;rmico, principalmente. A <span id=\"urn:enhancement-277a44e2-a9f7-4cc3-a845-615907dbfd03\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> &eacute; uma grandeza que pode mensurar esses valores e &eacute; estudada por meio da <span id=\"urn:enhancement-e13bbd69-26d0-4551-b5c5-1fe529f1549f\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/lei-de-hess\">Lei de Hess<\/span>.<p class=\"wp-block-paragraph\">Esse conceito qu&iacute;mico-matem&aacute;tico &eacute; necess&aacute;rio para a compreens&atilde;o de rea&ccedil;&otilde;es qu&iacute;micas, em especial aquelas que passam por diferentes etapas para chegar ao resultado final. Em termos de vest&iacute;bulares, a <span id=\"urn:enhancement-6b3f1295-7825-471c-9151-5bd74ff1dd44\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/lei-de-hess\">Lei de Hess<\/span> pode ser utilizada para entender se um determinado composto &eacute; formado a partir de absor&ccedil;&atilde;o ou libera&ccedil;&atilde;o de <span id=\"urn:enhancement-01bc64ec-6f7d-4a3c-aaa9-e65ae64ebfc8\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span>, por exemplo.<\/p><p class=\"wp-block-paragraph\">Para te ajudar no entendimento da <span id=\"urn:enhancement-226c2b4a-46ec-49d7-a39d-1b4b90d1bc5e\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/lei-de-hess\">Lei de Hess<\/span>, <span id=\"urn:enhancement-abb1e8e8-2ac8-47e1-a4f1-54a4b7cf6a60\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> e outros conceitos da <span id=\"urn:enhancement-44930ddd-f607-4fac-9547-da03aa5399b4\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termoquimica\">termoqu&iacute;mica<\/span>, o <span id=\"urn:enhancement-0a7ad0e4-9524-47c5-ad07-57832d79efff\" class=\"textannotation disambiguated wl-organization\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/estrategia_vestibulares\">Estrat&eacute;gia Vestibulares<\/span> preparou um resumo completo com as informa&ccedil;&otilde;es essenciais no tema. Inclusive, foram resolvidas e comentadas quest&otilde;es de prova que abordam esse assunto de forma direta ou indireta.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Navegue pelo conte\u00fado<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/lei-de-hess\/#O-que-e-Lei-de-Hess\" >O que &eacute; Lei de Hess?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/lei-de-hess\/#Calculos-da-Lei-de-Hess\" >C&aacute;lculos da Lei de Hess<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/lei-de-hess\/#Diagrama-de-entalpia\" >Diagrama de entalpia<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/lei-de-hess\/#Estude-mais-de-quimica-com-a-Coruja\" >Estude mais de qu&iacute;mica com a Coruja!<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-o-que-e-lei-de-hess\"><span class=\"ez-toc-section\" id=\"O-que-e-Lei-de-Hess\"><\/span>O que &eacute; Lei de Hess?<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Em termos gerais, a <span id=\"urn:enhancement-03a181f4-510b-4d69-a749-fa95385c84e0\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/lei-de-hess\">Lei de Hess<\/span> &eacute; um padr&atilde;o qu&iacute;mico-matem&aacute;tico utilizado para encontrar a varia&ccedil;&atilde;o de <span id=\"urn:enhancement-28d31c2f-cb72-4148-9d0a-e63b246cdf78\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> de rea&ccedil;&otilde;es qu&iacute;micas em um determinado sistema. &Eacute; a partir desse conceito que surgem grande parte dos conhecimentos termoqu&iacute;micos.<\/p><p class=\"wp-block-paragraph\">Uma vez que a <span id=\"urn:enhancement-f62df8d4-2904-4015-a6f7-9d205c6cf6f6\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/lei-de-hess\">Lei de Hess<\/span> trata sobre a varia&ccedil;&atilde;o de <span id=\"urn:enhancement-4af89c78-1d42-4437-8a0a-1d42a0fe071e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span>, &eacute; importante entender o que &eacute; essa grandeza. A defini&ccedil;&atilde;o de <span id=\"urn:enhancement-7201e1c0-24ad-43f4-8ab2-ddc5851fe182\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> trata sobre toda a energia interna presente em um corpo, a depender de seu <span id=\"urn:enhancement-0c082511-1f35-43f6-a079-eec51a4de6d9\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/volume\">volume<\/span> e press&atilde;o.&nbsp;<\/p><p class=\"wp-block-paragraph\">Apesar de ser um conceito bem estabelecido, medir a <span id=\"urn:enhancement-60307751-0ee3-4a9c-aca4-2ba008ab3001\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> de um <span id=\"urn:enhancement-a7097ff0-316c-4cbe-9621-568bf628cfa1\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagente<\/span> ou <span id=\"urn:enhancement-6087774d-b856-49bb-b9a2-ac155202873a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produto<\/span> de uma <span id=\"urn:enhancement-40a5d1b7-064f-443b-b512-77fbeb489b84\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reacao-quimica\">rea&ccedil;&atilde;o qu&iacute;mica<\/span> n&atilde;o &eacute; uma tarefa poss&iacute;vel. &Eacute; por isso que a ci&ecirc;ncia <a href=\"https:\/\/www.youtube.com\/watch?v=j2z-xLxg7hg&amp;pp=ygUkZXN0cmF0ZWdpYSB2ZXN0aWJ1bGFyZXMgdGVybW9xdWltaWNh\" target=\"_blank\">termoqu&iacute;mica<\/a> foca principalmente em medir a varia&ccedil;&atilde;o da <span id=\"urn:enhancement-3b66e255-5f6f-4db3-98d1-466196ebd65d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> em uma rea&ccedil;&atilde;o, partindo do est&aacute;gio inicial at&eacute; o ponto em que os <span id=\"urn:enhancement-8a0fd6df-14ed-4bc7-9982-f39d83800ff6\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produtos<\/span> definitivos s&atilde;o formados.&nbsp;<\/p><h2 class=\"wp-block-heading\" id=\"h-calculos-da-lei-de-hess\"><span class=\"ez-toc-section\" id=\"Calculos-da-Lei-de-Hess\"><\/span>C&aacute;lculos da Lei de Hess<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Como foi apresentado at&eacute; aqui, a <span id=\"urn:enhancement-5df683f2-6aeb-4b2d-a303-a388e5be94c4\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/lei-de-hess\">Lei de Hess<\/span> &eacute; uma interface entre opera&ccedil;&otilde;es matem&aacute;ticas com grandezas qu&iacute;micas, que &eacute; a <span id=\"urn:enhancement-ee940ade-5071-4196-ae91-d572e139afdd\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span>. Diante disso, o c&aacute;lculo que a representa &eacute; dado pela diferen&ccedil;a entre a <span id=\"urn:enhancement-e05516aa-2370-4d43-b9a4-8e546b1aa944\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> final do sistema e a <span id=\"urn:enhancement-555663a4-8a6f-4a24-bf16-3930d5121710\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> inicial.&nbsp;<\/p><p class=\"wp-block-paragraph\">Em geral, a grandeza <span id=\"urn:enhancement-c90a205b-8a32-444b-a7db-b4726861f9a5\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> &eacute; representada matematicamente com H. Diante disso, a f&oacute;rmula ser&aacute;:<\/p><p class=\"wp-block-paragraph\">&Delta;H = H<sub>f<\/sub> &ndash; H<sub>i<\/sub><br>&Delta;H &rarr; varia&ccedil;&atilde;o de <span id=\"urn:enhancement-2ba10044-2e6c-4b35-84b8-f6295d57690b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span><br>H<sub>f<\/sub> &rarr; <span id=\"urn:enhancement-ee71e681-1a88-4402-9c62-cf03a32f3a5c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> ao final do processo<br>H<sub>i <\/sub>&rarr; <span id=\"urn:enhancement-8228150e-f473-4047-9ce7-406f77a9c4ba\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> no in&iacute;cio do processo<\/p><p class=\"wp-block-paragraph\">Em geral, a varia&ccedil;&atilde;o de <span id=\"urn:enhancement-2a696188-7be0-4f21-81b5-b3ac36ddc6c0\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> &eacute; fornecida nas unidades de kJ\/<span id=\"urn:enhancement-096d20e0-ea4e-46cf-85d5-41c87a5a6fe2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span> (quiloJoules por <span id=\"urn:enhancement-5dcdd3a7-6596-4f4e-b44e-bc47544df3d4\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>), sempre considerando condi&ccedil;&otilde;es de temperatura e press&atilde;o.&nbsp;<\/p><p class=\"wp-block-paragraph\">Note que a <span id=\"urn:enhancement-677e7160-c3f5-410c-a650-55eb93395157\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> n&atilde;o leva em considera&ccedil;&atilde;o quaisquer <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/reacoes-quimicas\/\" target=\"_blank\">rea&ccedil;&otilde;es qu&iacute;micas <\/a>intermedi&aacute;rias que aconte&ccedil;am durante a forma&ccedil;&atilde;o de determinado <span id=\"urn:enhancement-adfb7e1e-21a2-4bc1-a327-7cf8da5a45fd\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produto<\/span>. Ent&atilde;o, independentemente do n&uacute;mero de rea&ccedil;&otilde;es intermedi&aacute;rias de um processo qu&iacute;mico, a <span id=\"urn:enhancement-26e0c6d8-18ac-40bb-a9bf-e2d7f40e0aee\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> ser&aacute; sempre calculada a partir dos valores de H no in&iacute;cio e final de todas as etapas.&nbsp;<\/p><p class=\"wp-block-paragraph\">Nos casos em que muitas rea&ccedil;&otilde;es qu&iacute;micas intermedi&aacute;rias acontecem entre os <span id=\"urn:enhancement-06f17535-2e4e-4055-b834-f0f9bb1f196b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagentes<\/span> iniciais e os <span id=\"urn:enhancement-e103ec01-24a8-4ef7-9ebd-299890e0d422\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produtos<\/span> finais, a <span id=\"urn:enhancement-4a1aad0e-e155-4d6c-ba81-5a34388ccf6f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> pode ser calculada como se fosse uma soma\/subtra&ccedil;&atilde;o <span id=\"urn:enhancement-6df8d314-69df-4e8e-9185-b65f8bbc3089\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/matematica\">matem&aacute;tica<\/span> montada. Observe na resolu&ccedil;&atilde;o de quest&atilde;o abaixo, de forma pr&aacute;tica.<\/p><p class=\"wp-block-paragraph\">(<span id=\"urn:enhancement-9f113e59-dc88-43f5-b686-744469dfc5bd\" class=\"textannotation disambiguated wl-organization\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/fuvest\">Fuvest<\/span>) O &ldquo;besouro bombardeiro&rdquo; espanta seus predadores expelindo uma solu&ccedil;&atilde;o quente. Quando amea&ccedil;ado, em seu <span id=\"urn:enhancement-16ceb27d-7d9e-4517-8898-ad9bddaab66f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/organismos\">organismo<\/span> ocorre a mistura de solu&ccedil;&otilde;es aquosas de hidroquinona, <span id=\"urn:enhancement-7ce4d83d-6b88-47be-9cda-685899b9836c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/peroxido-de-hidrogenio\">per&oacute;xido de hidrog&ecirc;nio<\/span> e enzimas, que promovem uma rea&ccedil;&atilde;o exot&eacute;rmica, representada por:<\/p><p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-a2c9ea5d-18a3-4da6-8b0f-d6e1afda9c38\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>(<span id=\"urn:enhancement-4217bae8-e3e5-467d-bdf8-b4d87bb10110\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/hidroxila\">OH<\/span>)<sub>2(aq)<\/sub> + H<sub>2<\/sub>O<sub>2(aq)<\/sub> &rarr; <span id=\"urn:enhancement-fb5e2608-330b-4090-ac1e-8729dc77f0b0\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>O<sub>2(aq) <\/sub>+ 2 H<sub>2<\/sub>O<sub>(l)<\/sub><\/p><p class=\"wp-block-paragraph\">O <span id=\"urn:enhancement-86419cbe-7959-4be7-a5a8-ef48dc86c4b3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> envolvido nessa transforma&ccedil;&atilde;o pode ser calculado, considerando-se os processos:<\/p><p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-78f6815f-edcd-44ab-b819-c55615574ec6\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>(<span id=\"urn:enhancement-d4176f3b-5303-480b-9dbc-a647d3667b0f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/hidroxila\">OH<\/span>)<sub>2(aq) <\/sub>&rarr; <span id=\"urn:enhancement-4322d949-23da-44b3-b3aa-dd80e869ad89\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>O<sub>2(aq) <\/sub>+ H<sub>2(g) <\/sub>&Delta;H = +177 kJ . <span id=\"urn:enhancement-5ab92d02-10f3-4948-ae29-c9717738a917\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">H<sub>2<\/sub>O<sub>(l)<\/sub> + &frac12; O<sub>2(g)<\/sub> &rarr; H<sub>2<\/sub>O<sub>2(aq)<\/sub> &Delta;H = +95 kJ . <span id=\"urn:enhancement-d1829385-20c1-4273-bcaf-a7f038d8ce54\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">H<sub>2<\/sub>O<sub>(l)<\/sub> &rarr; &frac12; O<sub>2(g)<\/sub> + H<sub>2(g)<\/sub> &Delta;H = +286 kJ . <span id=\"urn:enhancement-9030ae99-479e-4bb4-b32b-70a71a795730\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">Assim sendo, o <span id=\"urn:enhancement-cac3e1da-6c05-4cf5-b6f1-2e2de190b002\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> envolvido na rea&ccedil;&atilde;o que ocorre no <span id=\"urn:enhancement-460ccef8-2c95-4ae4-a664-e9f73b75f48d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/organismos\">organismo<\/span> do besouro &eacute;:<\/p><p class=\"wp-block-paragraph\">a) -558 kJ . <span id=\"urn:enhancement-cbde51ab-f006-4d3b-b101-06826bc07727\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">b) -204 kJ . <span id=\"urn:enhancement-0280312e-54a3-43c5-b65b-a95fd882dc0c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-eac55cfe-9594-41db-8b98-ce9f86798e76\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">c<\/span>) -177 kJ . <span id=\"urn:enhancement-55243f68-f627-494f-8a45-e7d1e276084c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">d) +558 kJ . <span id=\"urn:enhancement-0c6de1a4-c587-4529-a99b-3ac252384240\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">e) +585 kJ . <span id=\"urn:enhancement-78dae483-5b7f-4f2f-8ce5-5bd3fdad83d0\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">Note que o enunciado da quest&atilde;o j&aacute; fornece qual seria a rea&ccedil;&atilde;o final esperada para esse processo, que &eacute;:<\/p><p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-79826176-db46-4a67-a3b7-20ae2bdd6bbf\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>(<span id=\"urn:enhancement-cc39b0a3-952d-4d80-ab18-73546e060f4c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/hidroxila\">OH<\/span>)<sub>2(aq)<\/sub> + H<sub>2<\/sub>O<sub>2(aq)<\/sub> &rarr; <span id=\"urn:enhancement-5364a300-3f3e-484a-b714-a28bee78ae1b\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>O<sub>2(aq) <\/sub>+ 2 H<sub>2<\/sub>O<sub>(l)<\/sub><\/p><p class=\"wp-block-paragraph\">Diante disso, &eacute; importante ordenar as outras rea&ccedil;&otilde;es qu&iacute;micas para que somados e subtra&iacute;dos, resultem nessa <span id=\"urn:enhancement-55691ff3-2520-4421-bd9b-d4a2a74d0cfb\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> <span id=\"urn:enhancement-36653934-e00b-44a4-9760-944e754fbc61\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span>. Lembre-se que quando uma <span id=\"urn:enhancement-2898b744-4d98-458f-ab82-ffa17253d88d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncia<\/span> &eacute; <span id=\"urn:enhancement-48928075-8d53-4463-aacc-2dc16f54e04a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produto<\/span> de uma rea&ccedil;&atilde;o I e <span id=\"urn:enhancement-33bef9bf-7029-46a5-9dfa-95a4940dd1ce\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagente<\/span> da rea&ccedil;&atilde;o II, significa que ela ser&aacute; formada em uma das etapas para ser gasta em outra &mdash; sempre considerando a quantidade em mols da mol&eacute;cula. Diante disso, elas esse tipo de <span id=\"urn:enhancement-76646522-52cb-4281-bc87-d05a10fea489\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncia<\/span> tende a n&atilde;o aparecer na <span id=\"urn:enhancement-d5e56d35-b686-4cfd-b897-4d984ab0f3e5\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> <span id=\"urn:enhancement-e60322cd-5f46-4486-92eb-60c470231a15\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span> final. Acompanhe!<\/p><p class=\"wp-block-paragraph\">(A) <span id=\"urn:enhancement-efd5f750-5755-47c9-bc0c-76a589c439bf\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>(<span id=\"urn:enhancement-a7371034-b198-4429-8026-24e0d23da9df\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/hidroxila\">OH<\/span>)<sub>2(aq) <\/sub>&rarr; <span id=\"urn:enhancement-96d99752-157f-442b-95bb-9e4aee8b227b\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>O<sub>2(aq) <\/sub>+ H<sub>2(g) <\/sub>&Delta;H = +177 kJ . <span id=\"urn:enhancement-97028085-c9a9-4acc-8bbc-5bb6d8ac8a7b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">Essa rea&ccedil;&atilde;o A foi colocada exatamente como apresentada no enunciado, porque seu primeiro <span id=\"urn:enhancement-b21efca9-c43b-46de-9215-7057ddbfc93d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagente<\/span> (<span id=\"urn:enhancement-ba5224c2-8f64-42c6-a724-4f7c09a80bd8\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><sub>6<\/sub>H<sub>4<\/sub>(<span id=\"urn:enhancement-d6131f76-e2e7-48f9-b1c1-330a0709ebed\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/hidroxila\">OH<\/span>)<sub>2(aq) <\/sub>) tamb&eacute;m aparece como <span id=\"urn:enhancement-bb45fd12-1d60-408b-beec-83e4a592559d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagente<\/span> da rea&ccedil;&atilde;o final. N&atilde;o &eacute; necess&aacute;rio fazer multiplica&ccedil;&otilde;es no n&uacute;mero de mols, porque tamb&eacute;m est&aacute; equivalente com a ideia final.<\/p><p class=\"wp-block-paragraph\">(B) H<sub>2<\/sub>O<sub>(l)<\/sub> + &frac12; O<sub>2(g)<\/sub> &rarr; H<sub>2<\/sub>O<sub>2(aq)<\/sub> &Delta;H = +95 kJ . <span id=\"urn:enhancement-ea9d528c-c524-4937-8af0-828d0ca0715b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">Nessa <span id=\"urn:enhancement-b734fff4-7012-4646-a7dd-95b6a2815886\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> B, note que existem dois <span id=\"urn:enhancement-8aa7f910-a03f-4839-b9c0-740bf1765ff3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagentes<\/span> que n&atilde;o aparecem nos <span id=\"urn:enhancement-9fb01611-eed2-436a-96d3-e6cdac94dc78\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagentes<\/span> da <span id=\"urn:enhancement-07db55e3-5614-48ee-8e97-394dede38f90\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> final, mas a &aacute;gua (H<sub>2<\/sub>O) surge como <span id=\"urn:enhancement-3c90eab8-d42e-4a7b-bec9-3227148655ba\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produto<\/span>. Diante disso, observa-se que o <span id=\"urn:enhancement-cdf3ec60-8994-4b7a-a872-f9e5e8fcd6d8\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produto<\/span> H<sub>2<\/sub>O<sub>2<\/sub> &eacute; <span id=\"urn:enhancement-31d4f7cc-0b90-4c81-a77c-48d6bc55fee7\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagente<\/span> da <span id=\"urn:enhancement-9bc980fd-7f7f-4f8f-8cd1-81e4bcbb1af9\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> final. Isso indica que essa <span id=\"urn:enhancement-50085e67-8025-4389-9c81-98ec61db9645\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> deve aparecer invertida no processo qu&iacute;mico dentro do besouro. Para inverter a <span id=\"urn:enhancement-2cf06429-ec47-4b03-976b-5346f4dc5c6a\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> &eacute; necess&aacute;rio trocar <span id=\"urn:enhancement-21864d70-834c-4e80-a479-5f5d8526f33e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagentes<\/span> por <span id=\"urn:enhancement-e2de6757-6e61-4f56-8ba8-8dcfd0d61185\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produtos<\/span> e tamb&eacute;m inverter o sinal da varia&ccedil;&atilde;o de <span id=\"urn:enhancement-fad935ae-650a-4f00-bfa2-a47eca6a7d78\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span>.&nbsp;<\/p><p class=\"wp-block-paragraph\">(B)&nbsp; H<sub>2<\/sub>O<sub>2(aq) <\/sub>&rarr;H<sub>2<\/sub>O<sub>(l)<\/sub> + &frac12; O<sub>2(g)<\/sub> &Delta;H = &ndash; 95 kJ . <span id=\"urn:enhancement-8255da09-0e67-4702-8baa-d9aeb5bc7438\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">Por fim, na <span id=\"urn:enhancement-a331eb83-8ff5-4527-bfe5-25a05eb79266\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span>:<\/p><p class=\"wp-block-paragraph\">(<span id=\"urn:enhancement-b4f1203e-3f69-4261-954d-c3b16ee3d884\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>) H<sub>2<\/sub>O<sub>(l)<\/sub> &rarr; &frac12; O<sub>2(g)<\/sub> + H<sub>2(g)<\/sub> &Delta;H = +286 kJ . <span id=\"urn:enhancement-ed5ab4b8-39ca-424e-8a79-f846ff3bf4d2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">Note que a &aacute;gua aparece tamb&eacute;m como <span id=\"urn:enhancement-109a0500-8430-4891-9ea5-45ad21916838\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagente<\/span> nessa <span id=\"urn:enhancement-2d4d7b68-2f94-4762-a3f4-88bcbeac35f5\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span>, mas &eacute; necess&aacute;rio que seja um <span id=\"urn:enhancement-a754bf42-c2ea-4c47-b641-628270f1e389\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produto<\/span> na rea&ccedil;&atilde;o final. Portanto, &eacute; importante inverter tamb&eacute;m <span id=\"urn:enhancement-435ab442-a3f3-472c-b3eb-70e01e85f4c8\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>:<\/p><p class=\"wp-block-paragraph\">(<span id=\"urn:enhancement-c7f2ed5a-afcc-4a46-b918-555549cf7478\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>)&nbsp; &frac12; O<sub>2(g)<\/sub> + H<sub>2(g) <\/sub>&rarr; H<sub>2<\/sub>O<sub>(l)&nbsp; <\/sub>&Delta;H = -286 kJ . <span id=\"urn:enhancement-e225d036-bc9f-45ec-bf88-319d380c0c43\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/mol\">mol<\/span>-1<\/p><p class=\"wp-block-paragraph\">Agora, podemos juntar todas as rea&ccedil;&otilde;es j&aacute; adaptadas, para formar uma <span id=\"urn:enhancement-c5d485d4-bb9f-453f-886f-bf6cd0cabcab\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> <span id=\"urn:enhancement-1ae96b8c-d0a9-48de-b4bb-88dcaa3124a3\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/matematica\">matem&aacute;tica<\/span> e somar ou subtrair as <span id=\"urn:enhancement-92ba241c-dff0-4c49-8e15-bc1308e7f8a4\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncias<\/span> iguais.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"534\" height=\"169\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2023\/05\/image-19.png\" alt=\"rea&ccedil;&otilde;es em Lei de Hess\" class=\"wp-image-91745\"><\/figure>\n<\/div><p class=\"wp-block-paragraph\">Observe como as <span id=\"urn:enhancement-2747a1ef-c05d-4add-bd38-d57729e88f2c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/substancia\">subst&acirc;ncias<\/span> qu&iacute;micas destacadas aparecem no <span id=\"urn:enhancement-181c1e87-c354-4d92-ae2f-286b018d05d3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/produtos\">produto<\/span> e <span id=\"urn:enhancement-2b63584c-8a6c-442f-b700-aa9a4d4d2741\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reagentes\">reagente<\/span> de diferentes rea&ccedil;&otilde;es, com a mesma quantidade. Isso significa que foram formadas e gastas dentro do processo, ent&atilde;o podem ser exclu&iacute;das da rea&ccedil;&atilde;o final.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"557\" height=\"276\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2023\/05\/image-20.png\" alt=\"Rea&ccedil;&atilde;o qu&iacute;mica final \" class=\"wp-image-91746\"><\/figure>\n<\/div><p class=\"wp-block-paragraph\">Agora, j&aacute; foi montada a rea&ccedil;&atilde;o final exatamente como o exerc&iacute;cio prop&ocirc;s, ent&atilde;o percebemos que o caminho percorrido est&aacute; correto. Basta, ent&atilde;o, somar os valores de rea&ccedil;&atilde;o de <span id=\"urn:enhancement-baa766b3-7dd7-4a47-bbe3-e5d05dbaec21\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> para chegar ao resultado desejado: 177 &ndash; 95 &ndash; 286 =&nbsp; 204 kJ.mol<sup>-1<\/sup>, como prop&otilde;e a <strong>alternativa B<\/strong>.<\/p><h2 class=\"wp-block-heading\" id=\"h-diagrama-de-entalpia\"><span class=\"ez-toc-section\" id=\"Diagrama-de-entalpia\"><\/span>Diagrama de entalpia<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Outra forma de estudar e aplicar a <span id=\"urn:enhancement-99f30c9f-b3a3-4a9c-89c6-58a248724ecc\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/lei-de-hess\">Lei de Hess<\/span> e as varia&ccedil;&otilde;es de <span id=\"urn:enhancement-ba1ce7e9-882f-4178-b89d-9c10962b0094\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> &eacute; por meio de diagramas. Basicamente s&atilde;o representa&ccedil;&otilde;es gr&aacute;ficas que correlacionam o aumento ou redu&ccedil;&atilde;o da <span id=\"urn:enhancement-bdf29655-6080-4d00-a1d9-1cd25a3811c1\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> em cada etapa.&nbsp;<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2023\/05\/image-21.png\" alt=\"diagrama de entalpia\" class=\"wp-image-91747\" width=\"420\" height=\"357\"><figcaption class=\"wp-element-caption\">Imagem: Reprodu&ccedil;&atilde;o\/Wikimedia<\/figcaption><\/figure>\n<\/div><p class=\"wp-block-paragraph\">Depois de observar esse quadro, &eacute; importante fazer uma s&iacute;ntese das informa&ccedil;&otilde;es, para concluir se ao final do processo a rea&ccedil;&atilde;o &eacute;:<\/p><ul class=\"wp-block-list\">\n<li>Endot&eacute;rmica e absorve energia, com valor de &Delta;H&gt;0;<\/li>\n\n\n\n<li>Exot&eacute;rmica e libera energia, com valor de &Delta;H&lt;0.<\/li>\n<\/ul><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2023\/05\/image-17.png\" alt=\"lei de Hess com rea&ccedil;&atilde;o exot&eacute;rmica\" class=\"wp-image-91741\" width=\"389\" height=\"374\"><figcaption class=\"wp-element-caption\">Imagem: Reprodu&ccedil;&atilde;o\/Wikimedia<\/figcaption><\/figure>\n<\/div><p class=\"wp-block-paragraph\">Observe, nesta imagem, que a varia&ccedil;&atilde;o de <span id=\"urn:enhancement-eb8a7e3d-276e-42cc-a24b-fab94ec40463\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> parte de um valor alto (H<sub>R<\/sub> = H<sub>i<\/sub>) em dire&ccedil;&atilde;o a um valor mais baixo no eixo y. Isso significa que &eacute; uma varia&ccedil;&atilde;o negativa, exot&eacute;rmica, com libera&ccedil;&atilde;o de energia &mdash; geralmente s&atilde;o rea&ccedil;&otilde;es de combust&atilde;o.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2023\/05\/image-18.png\" alt=\"lei de Hess com rea&ccedil;&atilde;o endot&eacute;rmica\" class=\"wp-image-91743\" width=\"443\" height=\"383\"><figcaption class=\"wp-element-caption\">Imagem: Reprodu&ccedil;&atilde;o\/Wikimedia<\/figcaption><\/figure>\n<\/div><p class=\"wp-block-paragraph\">Nesta outra representa&ccedil;&atilde;o, observe como a <span id=\"urn:enhancement-7aa4ba41-f916-4d7c-87c7-527c762c52b2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/entalpia\">entalpia<\/span> final &eacute; maior que a inicial. Isso indica que o processo absorveu energia ao longo do processo, o que traz &agrave; tona a classifica&ccedil;&atilde;o de rea&ccedil;&atilde;o endot&eacute;rmica.&nbsp;<\/p><h2 class=\"wp-block-heading\" id=\"h-estude-mais-de-quimica-com-a-coruja\"><span class=\"ez-toc-section\" id=\"Estude-mais-de-quimica-com-a-Coruja\"><\/span>Estude mais de qu&iacute;mica com a Coruja!<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">A banca de provas da sua <span id=\"urn:enhancement-63158b85-5f62-4649-a239-3c8964d90ddc\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/faculdade\">faculdade<\/span> dos sonhos tem testes com primeira e segunda fase? O <span id=\"urn:enhancement-a9c1a2b4-e19c-44b0-875a-e361a4ba2542\" class=\"textannotation disambiguated wl-organization\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/estrategia_vestibulares\">Estrat&eacute;gia Vestibulares<\/span> pode te ajudar! Nossos simulados s&atilde;o constru&iacute;dos com base no modelo de prova de cada banca, com gabarito e corre&ccedil;&atilde;o, inclusive para os exerc&iacute;cios discursivos da segunda fase.&nbsp;<\/p><p class=\"wp-block-paragraph\">Para estudar e consolidar ainda mais os pontos de maior dificuldade, conte com os cursos da Coruja. Al&eacute;m de aulas claras, did&aacute;ticas e direcionadas, os materiais s&atilde;o acess&iacute;veis em diversas plataformas, com ferramentas interativas, possibilidade de anotar e destacar conte&uacute;dos. Conhe&ccedil;a essa e outras vantagens ao clicar no banner abaixo.<\/p><p class=\"wp-block-paragraph\"><a id=\"cta\" class=\"cta-imagem\" href=\"https:\/\/vestibulares.estrategia.com\/cursos\/\" target=\"blank\">\n                <img decoding=\"async\" width=\"100%\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/12\/EV2.jpg\" alt=\"CTA - Estrat\u00e9gia Vestibulares 2\" title=\"CTA - Estrat\u00e9gia Vestibulares 2\">\n        <\/a>\n\n\n\n\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"A termoqu&iacute;mica &eacute; a &aacute;rea de conhecimento que estuda as rea&ccedil;&otilde;es qu&iacute;micas e as energias relacionadas com elas,&hellip;\n","protected":false},"author":23,"featured_media":91705,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-91739","post","type-post","status-publish","format-standard","has-post-thumbnail","category-quimica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Lei de Hess: o que \u00e9, entalpia e quest\u00f5es resolvidas<\/title>\n<meta name=\"description\" content=\"Entalpia \u00e9 a grandeza que mede a energia trocada em rea\u00e7\u00f5es qu\u00edmicas, por meio da Lei de Hess. 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