If you have 2.9 x 10^21 atoms of nitrogen, how many moles do you have?

Approximately

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Explanation:

There are roughly 6.02 * 10^23 atoms in one mole of any element. So we have 6.02 * 10^23 atoms in one mole of nitrogen.

We can then do the following conversion:

c) always accurate

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1 is the answer to this problem