The percentage of water of crystallisation in hydrated Copper Sulphate $[C u S O_{4} .5 H_{2} O]$ is:
(Cu=63.5, S=32, O=16, H=1)

36.07 %

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72.14 %

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18.04 %

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54.94 %

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Solution

The correct option is A 36.07 %
$[C u S O_{4} .5 H_{2} O]$
Molar mass = 249.5 gm
% of water in hydrated copper sulphate $= 90 \times \frac{100}{249.5} = 36.07$

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