Write the chemical names and formulae of plaster of pairs and gypsum.

Plaster of Paris has a chemical name Calcium sulfate hemihydrate.

The formala of PLaster of Paris is $CaS{O}_4.\frac{1}{2}{H}_{2}O$

Chemical name of Gypsum is:Cslcium sulfate dihydrate.

The formula of Gypsum is:$CaS{O}_4.2H_{2}O$