{"id":8725,"date":"2024-08-06T00:27:25","date_gmt":"2024-08-06T03:27:25","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=8725"},"modified":"2024-09-09T19:28:41","modified_gmt":"2024-09-09T22:28:41","slug":"questao-50-enem-2016","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-50-enem-2016\/","title":{"rendered":"Quest\u00e3o 050 \u2013 ENEM 2016"},"content":{"rendered":"\n<p>O benzeno, um importante solvente para a ind\u00fastria qu\u00edmica, \u00e9 obtido industrialmente pela destila\u00e7\u00e3o do petr\u00f3leo. Contudo, tamb\u00e9m pode ser <strong>sintetizado pela trimeriza\u00e7\u00e3o do acetileno <\/strong>catalisada por ferro met\u00e1lico sob altas temperaturas, <strong>conforme a equa\u00e7\u00e3o qu\u00edmica:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"216\" height=\"34\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-223.png\" alt=\"\" class=\"wp-image-8726 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 216px; --smush-placeholder-aspect-ratio: 216\/34;\"><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>A energia envolvida nesse processo pode ser calculada indiretamente pela varia\u00e7\u00e3o de entalpia das rea\u00e7\u00f5es de combust\u00e3o das subst\u00e2ncias participantes<\/strong>, nas mesmas condi\u00e7\u00f5es experimentais:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"659\" height=\"116\" src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-224.png\" alt=\"\" class=\"wp-image-8727\" style=\"width:551px;height:auto\" title=\"\" srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-224.png 659w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-224-300x53.png 300w\" sizes=\"(max-width: 659px) 100vw, 659px\" \/><\/figure>\n\n\n\n<p><strong>A varia\u00e7\u00e3o de entalpia do processo de trimeriza\u00e7\u00e3o<\/strong>, em kcal, <strong>para a forma\u00e7\u00e3o de um mol de benzeno \u00e9 mais pr\u00f3xima de<\/strong><\/p>\n\n\n\n<p>A) \u22121 090.<\/p>\n\n\n\n<p>B) \u2212150.<\/p>\n\n\n\n<p>C) \u221250.<\/p>\n\n\n\n<p>D) +157.<\/p>\n\n\n\n<p>E) +470.<\/p>\n\n\n\n<p class=\"has-text-align-center has-large-font-size\"><strong>Solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n<p>A resolu\u00e7\u00e3o da quest\u00e3o envolvendo c\u00e1lculo da varia\u00e7\u00e3o de entalpia por Lei de Hess.&nbsp;A partir de manipula\u00e7\u00f5es nos processos intermedi\u00e1rios, podemos chegar na equa\u00e7\u00e3o global e em seguida obter o valor de \u0394H.<\/p>\n\n\n\n<p>A equa\u00e7\u00e3o global \u00e9 dada por:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" width=\"200\" height=\"34\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-225.png\" alt=\"\" class=\"wp-image-8728 lazyload\" style=\"--smush-placeholder-width: 200px; --smush-placeholder-aspect-ratio: 200\/34;width:159px;height:auto\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\"><\/figure>\n\n\n\n<p>Para que tenhamos 3 mol de C<sub>2<\/sub>H<sub>2<\/sub> na posi\u00e7\u00e3o dos reagentes, devemos multiplicar a equa\u00e7\u00e3o I por 3, incluindo o valor do \u0394H<sup>o<\/sup><sub>c<\/sub>.<\/p>\n\n\n\n<p>Para que tenhamos 1 mol de C<sub>6<\/sub>H<sub>6<\/sub> na posi\u00e7\u00e3o dos produtos, devemos inverter a equa\u00e7\u00e3o II e tamb\u00e9m o sinal da varia\u00e7\u00e3o de entalpia.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"664\" height=\"166\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-226.png\" alt=\"\" class=\"wp-image-8729 lazyload\" style=\"--smush-placeholder-width: 664px; --smush-placeholder-aspect-ratio: 664\/166;width:548px;height:auto\" title=\"\" data-srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-226.png 664w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/08\/image-226-300x75.png 300w\" data-sizes=\"(max-width: 664px) 100vw, 664px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p><strong>Alternativa B<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O benzeno, um importante solvente para a ind\u00fastria qu\u00edmica, \u00e9 obtido industrialmente pela destila\u00e7\u00e3o do petr\u00f3leo. Contudo, tamb\u00e9m pode ser sintetizado pela trimeriza\u00e7\u00e3o do acetileno catalisada por ferro met\u00e1lico sob altas temperaturas, conforme a equa\u00e7\u00e3o qu\u00edmica: A energia envolvida nesse processo pode ser calculada indiretamente pela varia\u00e7\u00e3o de entalpia das rea\u00e7\u00f5es de combust\u00e3o das subst\u00e2ncias [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":8726,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,23],"tags":[],"area-do-conhecimento":[116,120],"assunto":[],"class_list":["post-8725","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questoes-do-enem","category-23","area-do-conhecimento-ciencias-da-natureza-e-suas-tecnologias","area-do-conhecimento-quimica"],"_links":{"self":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/8725","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/comments?post=8725"}],"version-history":[{"count":2,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/8725\/revisions"}],"predecessor-version":[{"id":8731,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/8725\/revisions\/8731"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media\/8726"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=8725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=8725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=8725"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=8725"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=8725"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}