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Question
Calculate the percentage of water of crystallization in CuSO4. 5H2O
(H = 1, O = 16, S = 32, Cu = 64)
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Solution
Molar mass of CuSO4.5H2O = ( 64 ) + ( 32 ) + (9 x 16) + (10 x 1) = 250
Molar mass of 5.H2O molecules = ( 10 x 1) + ( 5 x 16) = 90
Percentage of water of Crystallisation = `[ 90 xx 100]/250` = 36%
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