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The conversion factor between atoms and moles is Avogadro's number: 6.02 x 1023 "things" / mole

To convert moles to atoms:

atoms B = 2.47 mol B6.02 x 1023 atoms B = 1.49E+24 atoms B

1 mol B

Multiply by atoms per mole. Moles cancel out.

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Q: How many B atoms are there in 2.47 moles of B?
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