1.

The crystalline salt Naw_(2)SO_(4).xH_(2)O 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 :44.1 G anhydrous `Na_(2)SO_(4)` are associated with `H_(2)O=55.9g`
Molar mass of ANHYD. `Na_(2)SO_(4)`
`=2xx23+32+4xx16`
`=142g`
`therefore "142 g of anhyd. "Na_(2)SO_(4)` will be associated with
`H_(2)O=(55.9)/(44.1)xx142g=180g="10 MOLES of "H_(2)O`


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