1.

Hydrated sulphate of a divalent metal of atomic weight 65.4 loses 43.85% of its weight on dehydration. Find the number of molecules of water of crystallisation in the formula of hydrated salt.

Answer»

SOLUTION :Formulae of divaelnt hydrated metal SULPHATE will be
`MSO_(4)xH_(2)O`
MOLECULAR MASS of salt`=65.4+96+18x`
`=(161.4+18x)`
% of water`=(18x)/(161.4+18x)xx100=43.85`
On solvingx=7
`therefore` Molecular FORMULA of hydrated salt `=MSO_(4).7H_(2)O`


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