Question

percentage of water crystallization in hydrated copper sulphate

Answer 1

Molar mass CuSO4 = 159.61 g/mol 
Molar mass CuSO4*5H2O = 249.68 g/mol 

% H2O = 5 x 18.02 x 100/ 249.68 = 36.1
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Answer 2

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Here's your answer...

The formula for hydrated copper sulphate is
CuSO4.5H2O
Mass of hydrated copper sulphate
=63.5+32+64+90
=249.5 amu
Mass of water in hydrated copper sulphate
=5*18=90
% of water in hydrated copper sulphate
$= \frac{90}{249.5} \times 100 \\ = 36.07\%$
(Approximately)

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