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Question

Calculate the mass of hydrated copper sulphate required to produce 56.90 g of the complex compound assuming other reagents to be present in excess.
CuSO4.5H2OCuSO4+5H2O
CuSO4+2KCNCu(CN)2+K2SO4
2Cu(CN)22CuCN+(CN)2
2CuCN+6KCN2K3[Cu(CN)4]

(Molar mass of K=39 g/mol, Cu=63.5 g/mol)

A
122.4 g
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B
19.96 g
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C
12.24 g
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D
49.9 g
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Solution

The correct option is D 49.9 g
Let the weight of CuSO4.5H2O be M g.
Since, atoms of Cu are conserved, apply POAC on Cu,
1×moles of CuSO4.5H2O= moles of K3[Cu(CN)4]

weight of CuSO4.5H2Omolar mass=weight of complex molar mass of complex

M249.5=56.90284.50

On solving, M=49.9 g


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