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If you were asked to convert 4.2 × 1022 atoms of aluminum to moles, which of the following should you use for the conversion?

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You should use Avogadro’s number for the conversion, because Avogadro’s Law states that there are 6.02 x 10^23 atoms per 1 mol of that substance.
4.2×1022/NA is a:
[tex] N_{A} is~ the~ Avogadro ~number[/tex][tex]6.022 x 10^23~ a/m[/tex](a/m)= atoms and moles


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