What is the number of oxygen atoms in of copper(II) sulfate pentahydrate, ?

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Problem

What is the number of oxygen atoms in

0.400\,\text{mol}

of copper(II) sulfate pentahydrate,

\mathrm{CuSO_4\cdot5H_2O}

? (1)

3.60

(2)

9

(3)

2.16\times10^{24}

(4)

5.40\times10^{24}