Question

The formula of gypsum and that of plaster of parls are CaSO4.xH2O and CaSO4.yH2O respectively.

Answer 1

Answer:

 $\frac{3}{2}$

Explanation:

Given formula of Gypsum:

               CaSO₄. xH₂O,

       True formula:

              CaSO₄. 2H₂O,  x  = 2

Formula of plaster of paris  = CaSO₄. $\frac{1}{2}$ H₂O,

               y  =  $\frac{1}{2}$

The difference between x and y; x - y:

               x  - y = 2 -  $\frac{1}{2}$  =  $\frac{3}{2}$