Question

Only half a molecule of water of crystalisation is shown to be attached to one formula unit of
calcium sulphate hemihydrate. Give reason​

Answer 1

Answer:

It is not possible to have half molecule of water. The formula CaSO₄.1/2 H₂O means that two formula units of CaSO₄ shares one molecule of water , in such a way that the effective water of crystallisation of one particular unit of calcium sulphate comes to 1/2 molecule of water.