How Many Molecules Of Water Of Crystallisation (Per Formula Unit) Are Present In Copper Sulphate Crystals

How many molecules of water of crystallisation (per formula unit) are present in : (a) copper sulphate crystals ? (b) washing soda? …

Answers:

(a) copper sulphate crystals :  5

(b) washing soda : 10

(c) gypsum : 2