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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 crystallization in the formula of hydrated salt.

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The correct Answer is:
7
`MSO_(4).xH_(2)O underset("Dehydration")rarr MSO_(4) + xH_(2)O`, Molar mass of `MSO_(4).xH_(2)O = 65.4 + 32 + 64 + 18 x`
`:. (18 x)/(161.4 + 18 x) xx 100 = 43.85, 1800 x = 7077.39 + 789.3 x rArr x = 7`
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