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Verified Answer :

TSO

To convert from atoms of argon to moles of argon, you need to divide by Avogadro's constant.

3.0110^23 atoms (1 mole/6.02210^23 atoms) = 0.500 moles Ar

0.500 moles of Argon is equal to 3.01
10^23 atoms of Argon.