The crystalline salt Na_(2)SO_(4) on heating loses 55.9 % of its weight. The formula of the crystalline salt is :

The crystalline salt Na_(2)SO_(4) on heating loses 55.9 % of its weigh

1.	The crystalline salt Na_(2)SO_(4) on heating loses 55.9 % of its weight. The formula of the crystalline salt is :
Answer» `Na_(2)SO_(4).5H_(2)O` `Na_(2)SO_(4).7H_(2)O` `Na_(2)SO_(4).2H_(2)O` `Na_(2)SO_(4).10H_(2)O` Solution :`("Molar MASS of "Na_(2)SO_(4).xH_+N578(2)O)/("Molar mass of "Na_(2)SO_(4))=(100)/(44.1)` `((142+18x)u)/(142u)=(100)/(44.1)` `(142 + 18 x)u = (100)/(44.1) xx(142 u) = 321.99u` `18 x = 321.99 - 142 = 179.99` `x = (179.99)/(18)=10` `:.` Formula of crystalline salt `= Na_(2)SO_(4).10H_(2)O`.