{"id":35923,"date":"2025-06-24T23:52:08","date_gmt":"2025-06-24T23:52:08","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=35923"},"modified":"2025-06-24T23:52:10","modified_gmt":"2025-06-24T23:52:10","slug":"calculate-the-formula-weight-and-molar-mass-of-al2so43-aluminum-sulfate-once-used-as-a-common-antiperspirant","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/calculate-the-formula-weight-and-molar-mass-of-al2so43-aluminum-sulfate-once-used-as-a-common-antiperspirant\/","title":{"rendered":"Calculate the formula weight and molar mass of Al2(SO4)3 (aluminum sulfate), once used as a common antiperspirant."},"content":{"rendered":"\n<p>Calculate the formula weight and molar mass of Al2(SO4)3 (aluminum sulfate), once used as a common antiperspirant.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>To calculate the formula weight and molar mass of aluminum sulfate, <strong>Al\u2082(SO\u2084)\u2083<\/strong>, we need to add up the atomic masses of all the atoms present in one formula unit.<\/p>\n\n\n\n<p><strong>Step-by-step calculation:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Aluminum (Al):<\/strong> Atomic mass \u2248 26.98 g\/mol<br>Number of Al atoms = 2<br>Total = 2 \u00d7 26.98 = <strong>53.96 g\/mol<\/strong><\/li>\n\n\n\n<li><strong>Sulfur (S):<\/strong> Atomic mass \u2248 32.07 g\/mol<br>Number of S atoms = 3<br>Total = 3 \u00d7 32.07 = <strong>96.21 g\/mol<\/strong><\/li>\n\n\n\n<li><strong>Oxygen (O):<\/strong> Atomic mass \u2248 16.00 g\/mol<br>Number of O atoms = 12 (4 per SO\u2084, 3 SO\u2084 groups)<br>Total = 12 \u00d7 16.00 = <strong>192.00 g\/mol<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Adding them together:<\/strong><\/p>\n\n\n\n<p>53.96 (Al) + 96.21 (S) + 192.00 (O) = <strong>342.17 g\/mol<\/strong><\/p>\n\n\n\n<p>So, the <strong>formula weight<\/strong> and <strong>molar mass<\/strong> of Al\u2082(SO\u2084)\u2083 is <strong>342.17 grams per mole<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation<\/h3>\n\n\n\n<p>Aluminum sulfate, Al\u2082(SO\u2084)\u2083, is a compound made of two aluminum ions and three sulfate ions. To determine its molar mass or formula weight, one must calculate the sum of the atomic masses of all atoms in its chemical formula. This is important in chemistry because molar mass allows scientists to convert between the mass of a substance and the number of moles, which are essential for stoichiometric calculations in chemical reactions.<\/p>\n\n\n\n<p>The process begins by examining the chemical formula. Al\u2082(SO\u2084)\u2083 indicates there are two aluminum atoms, three sulfur atoms, and twelve oxygen atoms. The atomic mass of each element can be found on the periodic table. Aluminum has an atomic mass of about 26.98 g\/mol. With two atoms, its contribution becomes 53.96 g\/mol. Sulfur, at 32.07 g\/mol, with three atoms contributes 96.21 g\/mol. Oxygen, with twelve atoms at 16.00 g\/mol each, adds 192.00 g\/mol. Summing all these gives the total molar mass: 342.17 g\/mol.<\/p>\n\n\n\n<p>Molar mass is the mass of one mole of a substance. For aluminum sulfate, this means that one mole of Al\u2082(SO\u2084)\u2083 weighs 342.17 grams. This value is the same as its formula weight because formula weight refers to the mass of the compound\u2019s formula unit in atomic mass units, and in grams per mole for practical laboratory use, both values are numerically equal.<\/p>\n\n\n\n<p>Understanding molar mass is crucial for laboratory work, particularly when preparing solutions or performing quantitative chemical reactions. Aluminum sulfate has also been widely used in water treatment and previously in antiperspirants, which makes knowledge of its molar mass important in both industrial and medical contexts.<\/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-banner8-708.jpeg\" alt=\"\" class=\"wp-image-35924\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-708.jpeg 852w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-708-250x300.jpeg 250w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-708-768x923.jpeg 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Calculate the formula weight and molar mass of Al2(SO4)3 (aluminum sulfate), once used as a common antiperspirant. The Correct Answer and Explanation is: To calculate the formula weight and molar mass of aluminum sulfate, Al\u2082(SO\u2084)\u2083, we need to add up the atomic masses of all the atoms present in one formula unit. Step-by-step calculation: Adding [&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-35923","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/35923","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=35923"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/35923\/revisions"}],"predecessor-version":[{"id":35925,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/35923\/revisions\/35925"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=35923"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=35923"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=35923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}