{"id":39617,"date":"2025-06-27T08:36:40","date_gmt":"2025-06-27T08:36:40","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=39617"},"modified":"2025-06-27T08:36:41","modified_gmt":"2025-06-27T08:36:41","slug":"a-system-contains-100-g-of-oxygen","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/a-system-contains-100-g-of-oxygen\/","title":{"rendered":"A system contains 100 g of oxygen"},"content":{"rendered":"\n<p>A system contains 100 g of oxygen. How many moles does it contain? How many molecules?<\/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><strong>Correct Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Moles of oxygen (O\u2082):<\/strong> 3.125 mol<\/li>\n\n\n\n<li><strong>Number of molecules:<\/strong> 1.883 \u00d7 10\u00b2\u2074 molecules<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>To determine the number of moles in 100 grams of oxygen and the number of molecules, start by understanding the molecular form and molar mass of oxygen.<\/p>\n\n\n\n<p>Oxygen gas exists as a diatomic molecule, meaning it appears as O\u2082 in nature. The atomic mass of a single oxygen atom is 16 grams per mole. Therefore, the molar mass of O\u2082 is:<\/p>\n\n\n\n<p><strong>Molar mass of O\u2082 = 16 g\/mol \u00d7 2 = 32 g\/mol<\/strong><\/p>\n\n\n\n<p>To find the number of <strong>moles<\/strong>, divide the given mass by the molar mass:<\/p>\n\n\n\n<p><strong>Moles = Mass \u00f7 Molar mass = 100 g \u00f7 32 g\/mol = 3.125 mol<\/strong><\/p>\n\n\n\n<p>Now that the number of moles is known, calculate the number of <strong>molecules<\/strong> using Avogadro\u2019s number. Avogadro\u2019s number is:<\/p>\n\n\n\n<p><strong>6.022 \u00d7 10\u00b2\u00b3 molecules\/mol<\/strong><\/p>\n\n\n\n<p>To find the number of molecules in 3.125 mol of oxygen:<\/p>\n\n\n\n<p><strong>Molecules = Moles \u00d7 Avogadro\u2019s number<\/strong><br><strong>= 3.125 mol \u00d7 6.022 \u00d7 10\u00b2\u00b3 molecules\/mol<\/strong><br><strong>= 1.882 \u00d7 10\u00b2\u2074 molecules (rounded to 3 significant figures)<\/strong><\/p>\n\n\n\n<p>This calculation shows that 100 grams of oxygen gas contains 3.125 moles, and this corresponds to about 1.883 \u00d7 10\u00b2\u2074 oxygen molecules. These steps are useful in chemistry when converting between mass, moles, and number of particles. Understanding the molar relationship helps in chemical reactions, stoichiometry, and other scientific calculations.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A system contains 100 g of oxygen. How many moles does it contain? How many molecules? The correct answer and explanation is: Correct Answer: Explanation: To determine the number of moles in 100 grams of oxygen and the number of molecules, start by understanding the molecular form and molar mass of oxygen. Oxygen gas exists [&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-39617","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/39617","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=39617"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/39617\/revisions"}],"predecessor-version":[{"id":39619,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/39617\/revisions\/39619"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=39617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=39617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=39617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}