Did the question give you any additional information beyond that? Since the solution is dissolved in liquid, you would need to know the Molarity in order to convert over into moles using the formula
Moles of Cu = Molarity x Volume
Avogadro's Number would factor in then once you had the Moles
Number of Cu atoms = Moles of Cu x 6.022 x 10^23 atoms/mol
So that is the general process that applies there ... to get a definitive answer you would need to know the concentration of the copper(II) sulfate solution
