{"id":24842,"date":"2025-06-18T18:43:52","date_gmt":"2025-06-18T18:43:52","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=24842"},"modified":"2025-06-18T18:43:54","modified_gmt":"2025-06-18T18:43:54","slug":"the-density-of-air-at-stp-is-1-285-g-l","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/the-density-of-air-at-stp-is-1-285-g-l\/","title":{"rendered":"The density of air at STP is 1.285 g\/L"},"content":{"rendered":"\n<p>The density of air at STP is 1.285 g\/L. Which of the following cannot be used to fill a balloon that will float in air at STP? CHA HF NH3 Ne NO<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer: NO (Nitric oxide)<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Explanation:<\/strong><\/h3>\n\n\n\n<p>To determine which gas <strong>cannot<\/strong> be used to fill a balloon that will float in air at <strong>standard temperature and pressure (STP)<\/strong>, we must compare the <strong>density<\/strong> of each gas to the <strong>density of air at STP (1.285 g\/L)<\/strong>. A balloon filled with a gas <strong>less dense than air<\/strong> will <strong>float<\/strong>, while one filled with a <strong>heavier (more dense) gas<\/strong> will <strong>sink<\/strong>.<\/p>\n\n\n\n<p>We will use the <strong>molar mass<\/strong> of each gas and the <strong>ideal gas law<\/strong> relationship:<\/p>\n\n\n\n<p>At STP, <strong>1 mole<\/strong> of any ideal gas occupies <strong>22.4 liters<\/strong>. So, the <strong>density<\/strong> of a gas at STP can be estimated as: Density&nbsp;(g\/L)=Molar&nbsp;Mass&nbsp;(g\/mol)22.4&nbsp;L\/mol\\text{Density (g\/L)} = \\frac{\\text{Molar Mass (g\/mol)}}{22.4 \\text{ L\/mol}}Density&nbsp;(g\/L)=22.4&nbsp;L\/molMolar&nbsp;Mass&nbsp;(g\/mol)\u200b<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Calculate Density for Each Gas:<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>CH\u2084 (Methane)<\/strong><br>Molar mass \u2248 12 + 4 = <strong>16 g\/mol<\/strong><br>Density = 16 \/ 22.4 \u2248 <strong>0.714 g\/L<\/strong> \u2192 <strong>lighter than air<\/strong> \u2192 <strong>floats<\/strong><\/li>\n\n\n\n<li><strong>HF (Hydrogen fluoride)<\/strong><br>Molar mass \u2248 1 + 19 = <strong>20 g\/mol<\/strong><br>Density = 20 \/ 22.4 \u2248 <strong>0.893 g\/L<\/strong> \u2192 <strong>lighter than air<\/strong> \u2192 <strong>floats<\/strong><\/li>\n\n\n\n<li><strong>NH\u2083 (Ammonia)<\/strong><br>Molar mass \u2248 14 + (3\u00d71) = <strong>17 g\/mol<\/strong><br>Density = 17 \/ 22.4 \u2248 <strong>0.759 g\/L<\/strong> \u2192 <strong>lighter than air<\/strong> \u2192 <strong>floats<\/strong><\/li>\n\n\n\n<li><strong>Ne (Neon)<\/strong><br>Molar mass = <strong>20.18 g\/mol<\/strong><br>Density = 20.18 \/ 22.4 \u2248 <strong>0.901 g\/L<\/strong> \u2192 <strong>lighter than air<\/strong> \u2192 <strong>floats<\/strong><\/li>\n\n\n\n<li><strong>NO (Nitric oxide)<\/strong><br>Molar mass = 14 + 16 = <strong>30 g\/mol<\/strong><br>Density = 30 \/ 22.4 \u2248 <strong>1.34 g\/L<\/strong> \u2192 <strong>heavier than air<\/strong> \u2192 <strong>sinks<\/strong><\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Conclusion:<\/strong><\/h3>\n\n\n\n<p>Only <strong>NO<\/strong> has a density <strong>greater than air<\/strong>, so it <strong>cannot<\/strong> be used to fill a balloon that will float in air at STP.<\/p>\n\n\n\n<p>\u2705 <strong>Answer: NO<\/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-banner8-19.jpeg\" alt=\"\" class=\"wp-image-24843\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-19.jpeg 852w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-19-250x300.jpeg 250w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-19-768x923.jpeg 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The density of air at STP is 1.285 g\/L. Which of the following cannot be used to fill a balloon that will float in air at STP? CHA HF NH3 Ne NO The Correct Answer and Explanation is: Correct Answer: NO (Nitric oxide) Explanation: To determine which gas cannot be used to fill a balloon [&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-24842","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/24842","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=24842"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/24842\/revisions"}],"predecessor-version":[{"id":24844,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/24842\/revisions\/24844"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=24842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=24842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=24842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}