We do this by dividing each percentage by the molar mass of the corresponding element. The molar mass of copper (Cu) is 63.546 g/mol, chlorine (Cl) is 35.453 g/mol, and oxygen (O) is 16.00 g/mol.
So, for copper, we have $\frac{24.2}{63.546} = 0.38$ moles, for
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