Question

the crystalline Salt Na2SO4xH2O on heating looses 55.9 % of its weight the formula of the crystalline salt is

Answer 1

We know, at.wt of Na=23, S=32,O=16,H=1.

Using that u can calculate mwt. of Na2SO4. Here I assume it as M.

Wt. of Hydrated salt=M+18x.

Therefore

0.559=18x/(M+18x) (As it loses 55.9 % of its water during dehydration.

Using this u can calculate value of x.