Each copper (II) sulfate unit is associated with five water molecules in crystalline copper (II) sulfate pent hydrate (CuSO4 X 5H2O). When this compound is heated in air above 100*C, it loses the water molecules and also its blue color:
CuSO4 X 5H2O -------->CuSO4 + 5H2O
Determine the number of moles of H2O originlly present in the compound if 9.6 g of CuSO4 are left after heating 15.01 g of the blue compound.