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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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