{"id":195291,"date":"2025-02-28T06:38:00","date_gmt":"2025-02-28T06:38:00","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=195291"},"modified":"2025-02-28T06:38:03","modified_gmt":"2025-02-28T06:38:03","slug":"how-many-atoms-of-each-element-are-in-a-formula-unit-of-calcium-carbonate-caco3","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/28\/how-many-atoms-of-each-element-are-in-a-formula-unit-of-calcium-carbonate-caco3\/","title":{"rendered":"How many atoms of each element are in a formula unit of calcium carbonate, CaCO3"},"content":{"rendered":"\n

How many atoms of each element are in a formula unit of calcium carbonate, CaCO3?<\/p>\n\n\n\n

a. 3 calcium atoms, 2 carbon atoms, 8 oxygen atoms<\/p>\n\n\n\n

b. 2 calcium atoms, 3 carbon atoms, 12 oxygen atoms<\/p>\n\n\n\n

c. 1 calcium atom, 1 carbon atom, 3 oxygen atoms<\/p>\n\n\n\n

d. 2 calcium atoms, 1 carbon atom, 4 oxygen atoms<\/p>\n\n\n\n

e. 1 calcium atom, 1 carbon atom, 4 oxygen atoms<\/p>\n\n\n\n

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

The correct answer is:<\/p>\n\n\n\n

c. 1 calcium atom, 1 carbon atom, 3 oxygen atoms<\/strong><\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n

Calcium carbonate (CaCO\u2083<\/strong>) is a chemical compound made up of three different elements: calcium (Ca), carbon (C), and oxygen (O). The chemical formula tells us the number of each type of atom present in one formula unit of the compound.<\/p>\n\n\n\n

Breaking down the formula:<\/strong><\/h4>\n\n\n\n
    \n
  1. Ca (Calcium)<\/strong><\/li>\n<\/ol>\n\n\n\n
      \n
    • The formula shows “Ca,” meaning there is one<\/strong> calcium atom per formula unit.<\/li>\n<\/ul>\n\n\n\n
        \n
      1. C (Carbon)<\/strong><\/li>\n<\/ol>\n\n\n\n
          \n
        • The formula has “C,” which indicates that there is one<\/strong> carbon atom.<\/li>\n<\/ul>\n\n\n\n
            \n
          1. O (Oxygen)<\/strong><\/li>\n<\/ol>\n\n\n\n
              \n
            • The subscript “\u2083” next to oxygen (O) means that there are three<\/strong> oxygen atoms.<\/li>\n<\/ul>\n\n\n\n

              Why is option C correct?<\/strong><\/h4>\n\n\n\n
                \n
              • The formula CaCO\u2083<\/strong> explicitly states that one molecule of calcium carbonate contains:<\/li>\n\n\n\n
              • 1 calcium atom<\/strong><\/li>\n\n\n\n
              • 1 carbon atom<\/strong><\/li>\n\n\n\n
              • 3 oxygen atoms<\/strong><\/li>\n<\/ul>\n\n\n\n

                Why are the other options incorrect?<\/strong><\/h4>\n\n\n\n
                  \n
                • Option A (3 Ca, 2 C, 8 O)<\/strong>: Incorrect because the formula does not indicate multiple calcium or carbon atoms.<\/li>\n\n\n\n
                • Option B (2 Ca, 3 C, 12 O)<\/strong>: Incorrect because the correct formula does not support these numbers.<\/li>\n\n\n\n
                • Option D (2 Ca, 1 C, 4 O)<\/strong>: Incorrect because CaCO\u2083 has only one calcium atom.<\/li>\n\n\n\n
                • Option E (1 Ca, 1 C, 4 O)<\/strong>: Incorrect because there are only three oxygen atoms, not four.<\/li>\n<\/ul>\n\n\n\n

                  Thus, the correct answer is C (1 Ca, 1 C, 3 O)<\/strong>.<\/p>\n\n\n\n

                  Now, I’ll generate an image representing calcium carbonate at the atomic level.<\/p>\n\n\n\n

                  \"\"<\/figure>\n\n\n\n

                  Here is an image representing the molecular structure of calcium carbonate (CaCO\u2083<\/strong>), showing the individual atoms and their bonding. Let me know if you need any modifications or additional explanations!<\/p>\n","protected":false},"excerpt":{"rendered":"

                  How many atoms of each element are in a formula unit of calcium carbonate, CaCO3? a. 3 calcium atoms, 2 carbon atoms, 8 oxygen atoms b. 2 calcium atoms, 3 carbon atoms, 12 oxygen atoms c. 1 calcium atom, 1 carbon atom, 3 oxygen atoms d. 2 calcium atoms, 1 carbon atom, 4 oxygen atoms […]<\/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-195291","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/195291","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=195291"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/195291\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=195291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=195291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=195291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}