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Saying that you have 2.0 moles of He is like saying that you have 2 dozen of something. We all know a dozen to be equal to 12, and in this case, the "dozen" is Avogadro's number (6.022*1023). If you multiply 2 dozen by 12, you'll have the number of whatever you're counting (24), and if you multiply 2.0 moles of He by Avogadro's number, you'll have the number of He atoms you're talking about.
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∙ 14y ago
Anonymous
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∙ 10y agoHelium (He) is a noble gas and exists as a monatomic element.
Atomic Mass of He = 4.0
Amount of He = 16/4.0 = 4.0mol
There are 4 moles of helium in a 16g sample.
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∙ 10y agoIn one mole of any substance, there are 6.02 x 1023 constituent particles, correct to three significant figures. This is the Avogadro constant. Thus for two moles of He, there are 1.20 x 1024 atoms. (Note that He is a monatomic gas and exists as a single atom.)
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∙ 15y agoM = 4 g/mol
n = 2 g * (1 mol /4 g) = 0.5 mol
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∙ 8y agoMolar mass of helium is 4gmol-1. so there are 0.6 moles of He.
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