Question

chemical formula for plaster of paris

Answer 1

The chemical name of Plaster of Paris is 'Hemihydrated Calcium Sulphate'
and its scientific/chemical formula is $CaSO_{4}. \frac{1}{2} H_{2}O$

Answer 2

CaSO4 . 1/2 H2O

 Calcium Sulphate hemihydrate