moles CuSO4 *5 H2O = 6.2 x 10^-3 g / 249.68 g/mol=2.5 x 10^-5
moles O = (4 + 5) x 2.5 x 10^-5=0.00022
atoms O = 0.00022 x 6.02 x 10^23=1.3 x 10^20
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moles CuSO4 *5 H2O = 6.2 x 10^-3 g / 249.68 g/mol=2.5 x 10^-5
moles O = (4 + 5) x 2.5 x 10^-5=0.00022
atoms O = 0.00022 x 6.02 x 10^23=1.3 x 10^20