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Hydrated sulphate of a divalent metal of...

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.

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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 solving x=7
`therefore` Molecular formula of hydrated salt `=MSO_(4).7H_(2)O`
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