How many molecules of water of crystallization are present in 1.648g of copper sulphate (CuSO4.5H2O). [At mass of Cu=63.5, S=32,O=16, H=1]
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Answer:The molecular weight of water H
2
O=2(1)+16=18g/mol.
The molecular weight of copper sulphate pentahydrate CuSO
4
.5H
2
O=64+32+4(16)+5(18)=250g/mol.
The percentage of water of crystallization in CuSO
4
.5H
2
O=
250
5×18
×100=36%.
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