When copper(II) sulfate pentahydrate (CuSO4 · 5H2O) is heated in air above 100°C, it loses...

When copper(II) sulfate pentahydrate (CuSO4 · 5H2O) is heated in air above 100°C, it loses the water molecules and its blue color:

If 9.60 g of CuSO4 are left after heating 15.01 g of the blue compound, calculate the number of moles of H2O originally present in the compound.