Question

formula of plaster of Paris​

Answer 1

Formula of Plaster of Paris:
${CaSO}_{4}$•$\frac{1}{2} {H}_{2} O$

Chemical name:
Calcium Sulphate Hemi hydrate

Answer 2

Plaster of Paris=CaSO4.½H2O

Gypsum=CaSO4.2H2O

CaSO4.2H2O------>CaSO4.½H2O+ 1½H2O(at 373 k)