4.39 g to a 22.65 g crucible brought to constant weight. CuSO4 XH2O is added by weighing and this crucible is heated in the burner flame for 15 minutes. heated throughout. Then the crucible is cooled in a desiccator and weighed again, and it is seen that 25.45 gr. (Cu: 63.5 g / mol; S: 32 g / mol; O: 16 g / mol; H: 1 g / mol)

A) Calculate% H2O by mass.

b) Calculate the number of water (X) per 1 mole of substance.