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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.
Helium (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.
In 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.)
There are approximately 1.204 x 10^24 helium atoms in 2 moles of helium (He). This is calculated by multiplying Avogadro's number (6.022 x 10^23 atoms/mol) by the number of moles (2).
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How many atoms and are there in 36g of water?
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five
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How many hydrogen atoms are present in 2 moles of ch4?
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