A crystalline hydrated salt on heating gives a residue 44.1% of its mass. The formula of that salt is:

A crystalline hydrated salt on heating gives a residue 44.1% of its ma

1.	A crystalline hydrated salt on heating gives a residue 44.1% of its mass. The formula of that salt is:
A.	Na2SO4.7H2 O
B.	Na2SO4.10H2O
C.	Na2SO4.2H2O
D.	Na2SO4.5H2O
Answer» C. Na2SO4.2H2O