{"id":28833,"date":"2025-06-20T16:22:13","date_gmt":"2025-06-20T16:22:13","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=28833"},"modified":"2025-06-20T16:22:16","modified_gmt":"2025-06-20T16:22:16","slug":"write-the-chemical-equation-for-the-formation-of-hbr-from-the-single-isolated-h-and-br-atoms","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/write-the-chemical-equation-for-the-formation-of-hbr-from-the-single-isolated-h-and-br-atoms\/","title":{"rendered":"Write the chemical equation for the formation of HBr from the single, isolated H and Br atoms."},"content":{"rendered":"\n<p>Write the chemical equation for the formation of HBr from the single, isolated H and Br atoms. Equation: H2 + Br2 -> 2HBr Using the table of bond energies, determine \u00ce\u201dH for the reaction. Think about the sign of the energy value in this reaction. Bond dissociation energies Energy (kJ\/mol): H-H: 436 H-F: 569 H-C: 410 H-Br: 366 H-I: 298 \u00ce\u201dH (kJ\/mol):<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"584\" src=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/image-105.png\" alt=\"\" class=\"wp-image-28834\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/image-105.png 1024w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/image-105-300x171.png 300w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/image-105-768x438.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>The Correct Answer and Explanation is:<\/strong><\/p>\n\n\n\n<p>The balanced chemical equation for the formation of hydrogen bromide is:<\/p>\n\n\n\n<p><strong>H\u2082 + Br\u2082 \u2192 2HBr<\/strong><\/p>\n\n\n\n<p>To determine the enthalpy change (\u0394H) of this reaction, we apply the bond energy method. This involves calculating the total energy required to break bonds in the reactants and subtracting the total energy released during the formation of bonds in the products.<\/p>\n\n\n\n<p><strong>Step 1: Break bonds in the reactants<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Breaking 1 mol of H\u2013H bonds requires 436 kJ<\/li>\n\n\n\n<li>Breaking 1 mol of Br\u2013Br bonds (not listed, but commonly known) requires 193 kJ<\/li>\n\n\n\n<li>Total energy input = 436 + 193 = 629 kJ<\/li>\n<\/ul>\n\n\n\n<p><strong>Step 2: Form bonds in the products<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Forming 2 mol of H\u2013Br bonds releases 2 \u00d7 366 = 732 kJ<\/li>\n<\/ul>\n\n\n\n<p><strong>Step 3: Calculate \u0394H<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0394H = Energy to break bonds \u2212 Energy to form bonds<\/li>\n\n\n\n<li>\u0394H = 629 \u2212 732 = <strong>\u2212103 kJ\/mol<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This negative enthalpy change means the reaction is exothermic. More energy is released in forming the H\u2013Br bonds than is absorbed to break the H\u2013H and Br\u2013Br bonds.<\/p>\n\n\n\n<p><strong>Explanation:<\/strong> In a chemical reaction, bond energies can be used to estimate the heat change by considering bonds broken and formed. Bonds must be broken in the reactants before new bonds are formed in the products. Breaking bonds always requires energy, whereas forming bonds releases energy. If more energy is released than absorbed, the reaction gives off heat.<\/p>\n\n\n\n<p>Here, it takes 629 kJ\/mol to break the original bonds in one mole of hydrogen and one mole of bromine molecules. However, the formation of two moles of hydrogen bromide releases 732 kJ\/mol. The result is a net release of 103 kJ of energy per mole of reaction, so the system becomes more stable after the reaction has occurred.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"852\" height=\"1024\" src=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-264.jpeg\" alt=\"\" class=\"wp-image-28835\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-264.jpeg 852w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-264-250x300.jpeg 250w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-264-768x923.jpeg 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Write the chemical equation for the formation of HBr from the single, isolated H and Br atoms. Equation: H2 + Br2 -> 2HBr Using the table of bond energies, determine \u00ce\u201dH for the reaction. Think about the sign of the energy value in this reaction. Bond dissociation energies Energy (kJ\/mol): H-H: 436 H-F: 569 H-C: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-28833","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=28833"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28833\/revisions"}],"predecessor-version":[{"id":28836,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28833\/revisions\/28836"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=28833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=28833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=28833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}