{"id":256273,"date":"2025-07-16T08:26:45","date_gmt":"2025-07-16T08:26:45","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=256273"},"modified":"2025-07-16T08:26:48","modified_gmt":"2025-07-16T08:26:48","slug":"which-of-the-following-reactions-represent-the-lattice-energy-of-li2o","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/16\/which-of-the-following-reactions-represent-the-lattice-energy-of-li2o\/","title":{"rendered":"Which of the following reactions represent the lattice energy of Li2O"},"content":{"rendered":"\n

Which of the following reactions represent the lattice energy of Li2O (\u00ce\u201dHlatt)? 1. 2 Li(s) + 1\/2 O2(g) \u00e2\u2020\u2019 Li2O(s) 2. 2 Li(g) + 1\/2 O2(g) \u00e2\u2020\u2019 Li2O(s) 3. Li2O(s) \u00e2\u2020\u2019 2 Li(aq) + 1\/2 O2(aq) 4. 2 Li(aq) + 1\/2 O2(aq) \u00e2\u2020\u2019 Li2O(s) 5. Li2O(s) \u00e2\u2020\u2019 2 Li(g) + 1\/2 O2(g)<\/p>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

The lattice energy of a compound represents the energy released when the ions in the gas phase come together to form the ionic solid. In this case, for Li\u2082O<\/strong>, the lattice energy corresponds to the energy released when the lithium (Li\u207a) and oxide (O\u00b2\u207b) ions in the gas phase combine to form the solid Li\u2082O.<\/p>\n\n\n\n

Let’s evaluate the given reactions to determine which one corresponds to the lattice energy of Li\u2082O:<\/p>\n\n\n\n

1. 2 Li(s) + 1\/2 O\u2082(g) \u2192 Li\u2082O(s)<\/h3>\n\n\n\n
    \n
  • This is the formation reaction of solid Li\u2082O from its elements in their standard states. This reaction gives the enthalpy of formation<\/strong> (\u0394Hf) of Li\u2082O, not the lattice energy.<\/li>\n<\/ul>\n\n\n\n

    2. 2 Li(g) + 1\/2 O\u2082(g) \u2192 Li\u2082O(s)<\/h3>\n\n\n\n
      \n
    • In this reaction, lithium atoms are in the gas phase, and oxygen is in the molecular form. This represents the combination of Li\u207a and O\u00b2\u207b ions in the gas phase to form solid Li\u2082O, which is exactly what the lattice energy represents: the energy released when the gaseous ions come together to form the ionic solid. This represents the lattice energy<\/strong> of Li\u2082O.<\/li>\n<\/ul>\n\n\n\n

      3. Li\u2082O(s) \u2192 2 Li(aq) + 1\/2 O\u2082(aq)<\/h3>\n\n\n\n
        \n
      • This is the dissolution process where Li\u2082O dissolves in water to form aqueous lithium (Li\u207a) and oxygen ions. This is related to the hydration energy<\/strong> and not the lattice energy.<\/li>\n<\/ul>\n\n\n\n

        4. 2 Li(aq) + 1\/2 O\u2082(aq) \u2192 Li\u2082O(s)<\/h3>\n\n\n\n
          \n
        • This reaction represents the formation<\/strong> of Li\u2082O from aqueous ions. It corresponds to the hydration energy<\/strong> in reverse, not the lattice energy.<\/li>\n<\/ul>\n\n\n\n

          5. Li\u2082O(s) \u2192 2 Li(g) + 1\/2 O\u2082(g)<\/h3>\n\n\n\n
            \n
          • This reaction represents the process of sublimation<\/strong> of Li\u2082O, where it is broken down into its gaseous components. This is the reverse of the lattice formation, which would require energy input, but it’s not the lattice energy itself.<\/li>\n<\/ul>\n\n\n\n

            Conclusion:<\/h3>\n\n\n\n

            The correct reaction that represents the lattice energy of Li\u2082O is reaction 2<\/strong>:
            2 Li(g) + 1\/2 O\u2082(g) \u2192 Li\u2082O(s)<\/strong>. This reaction shows the formation of Li\u2082O from its ions in the gas phase, which corresponds to the lattice energy.<\/p>\n\n\n\n

            \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

            Which of the following reactions represent the lattice energy of Li2O (\u00ce\u201dHlatt)? 1. 2 Li(s) + 1\/2 O2(g) \u00e2\u2020\u2019 Li2O(s) 2. 2 Li(g) + 1\/2 O2(g) \u00e2\u2020\u2019 Li2O(s) 3. Li2O(s) \u00e2\u2020\u2019 2 Li(aq) + 1\/2 O2(aq) 4. 2 Li(aq) + 1\/2 O2(aq) \u00e2\u2020\u2019 Li2O(s) 5. Li2O(s) \u00e2\u2020\u2019 2 Li(g) + 1\/2 O2(g) The Correct Answer […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-256273","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/256273","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=256273"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/256273\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=256273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=256273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=256273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}