When copper(II) sulfate pentahydrate(blue crystals) is heated in air above 100 degree celcious, it loses the water molecule and also its blue colour
CuSO4 . 5H2O -> CuSO4 + 5H2O (there is a dot in between the reactant cuso4 and 5h2o)
If 9.6g of CuSO4 are left after heating above 100 degree...