{"id":2435,"date":"2020-12-03T05:24:46","date_gmt":"2020-12-02T23:54:46","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=2435"},"modified":"2020-12-03T10:15:14","modified_gmt":"2020-12-03T04:45:14","slug":"molecular-mass","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/molecular-mass\/","title":{"rendered":"What is Molecular Mass"},"content":{"rendered":"
Molecular mass\/Formula mass<\/span><\/strong> Calculation of molecular mass from atomic masses <\/b><\/strong><\/span> Example:\u00a0<\/b><\/strong>Sulphuric acid has the formula H2<\/sub>SO4<\/sub>. It consists of two H, one S and four O atoms. The atomic masses of H, S and O are 1,32 and 16 respectively. Therefore, the molecular mass of H2<\/sub>SO4<\/sub> is Gram molecular mass<\/b><\/strong><\/span> People also ask<\/b><\/p>\n What is Molecular Mass\u00a0 Molecular mass\/Formula mass Molecular mass expresses as to how many times a molecule of a substance is heavier than th of the mass of an atom of carbon (carbon-12). Thus, Molecular mass =\u00a0 Molecular mass = 2 \u00d7 vapour density Example:\u00a0A molecule of water is 18 times heavier than th of […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[84],"tags":[1032,1057,1058,1056],"yoast_head":"\n
\nMolecular mass expresses as to how many times a molecule of a substance is heavier than th of the mass of an atom of carbon (carbon-12).
\nThus, Molecular mass =\u00a0\\(\\frac { Mass\\quad of\\quad a\\quad molecule }{ \\frac { 1 }{ 12 } th\\quad mass\\quad of\\quad a\\quad carbon\\quad atom\\quad (carbon-12) } \\)
\nMolecular mass = 2 \u00d7 vapour density
\nExample:\u00a0<\/b><\/strong>A molecule of water is 18 times heavier than th of the mass of carbon atom. Therefore, the molecular mass of water is 18 u.<\/p>\n
\nThe molecules are made up of two or more atoms of different elements. Therefore, the molecular mass may be calculated as the sum of the atomic masses of all the atoms in a molecule of that substance.
\nExample:\u00a0<\/b><\/strong>Ammonia has the formula, NH3<\/sub>. it consists of one atom of N and three atoms of H. The atomic mass of N and H are 14.0 and 1 respectively. Therefore, the molecular mass of NH3<\/sub> is
\nMolecular mass of NH3<\/sub> = Atomic mass of N + 3 \u00d7 Atomic mass of H
\n= 14 + 3 \u00d7 1 = 17 u<\/p>\n
\nMolecular mass of H2<\/sub>SO4<\/sub> =\u00a0(2 \u00d7 Atomic mass of H) + (1 \u00d7 Atomic mass of S)\u00a0+ (4 \u00d7 Atomic mass of O)
\n= (2 \u00d7 1) + (1 \u00d7 32) + (4 \u00d7 16) = 98 u<\/p>\n
\nThe molecular mass of a substance expressed in gram is called its gram molecular mass.
\nExample:\u00a0<\/b><\/strong>Molecular mass of oxygen, O2<\/sub> = 32 u
\nSo, gram molecular mass of oxygen, O2<\/sub> = 32 grams.<\/p>\n\n