Find the percentage mass of water in CuSO4.5H2O Cu = 64 , S=32 , O=16 , H=1 [2] b) At 127oC temperature and 38cm pressure a gas occupies 40 litres. Calculate its volume at S.T.P.
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Explanation:
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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