{"id":28568,"date":"2025-06-20T13:47:40","date_gmt":"2025-06-20T13:47:40","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=28568"},"modified":"2025-06-20T13:47:42","modified_gmt":"2025-06-20T13:47:42","slug":"the-molecular-mass-of-magnesium-sulfate-mgso-is-__-amu","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/the-molecular-mass-of-magnesium-sulfate-mgso-is-__-amu\/","title":{"rendered":"The molecular mass of magnesium sulfate (MgSO) is __ amu."},"content":{"rendered":"\n<p>The molecular mass of magnesium sulfate (MgSO<br>) is <strong><em>__<\/em><\/strong> amu. Select one: A. 175.87 B. 72 C. 120 D. 150<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-light-green-cyan-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer: A. 175.87 amu<\/strong><\/p>\n\n\n\n<p>To calculate the molecular mass (also called molecular weight) of magnesium sulfate (MgSO\u2084), we need to sum the atomic masses of all the atoms in the compound. Here\u2019s the breakdown:<\/p>\n\n\n\n<p><strong>Step 1: Identify the elements and their quantities in MgSO\u2084:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Magnesium (Mg): 1 atom<\/li>\n\n\n\n<li>Sulfur (S): 1 atom<\/li>\n\n\n\n<li>Oxygen (O): 4 atoms<\/li>\n<\/ul>\n\n\n\n<p><strong>Step 2: Use the atomic masses from the periodic table:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Magnesium (Mg) = 24.31 amu<\/li>\n\n\n\n<li>Sulfur (S) = 32.07 amu<\/li>\n\n\n\n<li>Oxygen (O) = 16.00 amu<\/li>\n<\/ul>\n\n\n\n<p><strong>Step 3: Multiply and sum:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mg: 1 \u00d7 24.31 = 24.31<\/li>\n\n\n\n<li>S: 1 \u00d7 32.07 = 32.07<\/li>\n\n\n\n<li>O: 4 \u00d7 16.00 = 64.00<\/li>\n<\/ul>\n\n\n\n<p><strong>Total molecular mass of MgSO\u2084 =<\/strong><br>24.31 (Mg) + 32.07 (S) + 64.00 (O) = <strong>120.38 amu<\/strong><\/p>\n\n\n\n<p>However, the question likely refers to <strong>magnesium sulfate heptahydrate<\/strong>, which is <strong>MgSO\u2084\u00b77H\u2082O<\/strong>, a common form in chemistry and pharmacy. Let\u2019s calculate its molecular mass as well:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>7 water molecules = 7 \u00d7 (2 \u00d7 1.01 + 16.00) = 7 \u00d7 18.02 = 126.14 amu<\/li>\n\n\n\n<li>MgSO\u2084 = 120.38 amu<\/li>\n<\/ul>\n\n\n\n<p><strong>Total for MgSO\u2084\u00b77H\u2082O = 120.38 + 126.14 = 246.52 amu<\/strong><\/p>\n\n\n\n<p>Since none of the choices match 246.52 amu, and if we go back to the original MgSO\u2084 only, <strong>120.38 amu<\/strong> would be the closest actual mass. However, option <strong>A: 175.87 amu<\/strong> suggests a typo or confusion with another hydrate form.<\/p>\n\n\n\n<p>If the sulfate form includes <strong>additional waters<\/strong>, such as <strong>MgSO\u2084\u00b7H\u2082O<\/strong> (monohydrate), its mass would be about:<\/p>\n\n\n\n<p>120.38 + 18.02 = 138.40 amu<\/p>\n\n\n\n<p>But <strong>none of the calculations<\/strong> lead to <strong>175.87 amu<\/strong> unless it is <strong>MgSO\u2084\u00b76H\u2082O<\/strong>, which would be:<\/p>\n\n\n\n<p>6 \u00d7 18.02 = 108.12<br>120.38 + 108.12 = <strong>228.50 amu<\/strong><\/p>\n\n\n\n<p>This indicates a likely error in the choices. But strictly for <strong>anhydrous MgSO\u2084<\/strong>, the correct molecular mass is <strong>120.38 amu<\/strong>, which matches closest with:<\/p>\n\n\n\n<p><strong>Correct answer: C. 120<\/strong><\/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-banner8-228.jpeg\" alt=\"\" class=\"wp-image-28578\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-228.jpeg 852w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-228-250x300.jpeg 250w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-228-768x923.jpeg 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The molecular mass of magnesium sulfate (MgSO) is __ amu. Select one: A. 175.87 B. 72 C. 120 D. 150 The Correct Answer and Explanation is: Correct Answer: A. 175.87 amu To calculate the molecular mass (also called molecular weight) of magnesium sulfate (MgSO\u2084), we need to sum the atomic masses of all the atoms [&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-28568","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28568","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=28568"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28568\/revisions"}],"predecessor-version":[{"id":28579,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28568\/revisions\/28579"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=28568"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=28568"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=28568"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}