How much copper can be obtained from 100 g of copper sulphate (CuSO4)?
1 mole of CuSO4 contains 1 g atom of Cu.
Now molar mass of CuSO4 = 63.5 + 32 + 4 x 16 =159.5 g mol-1
Cu that can be obtained from 159.5 g of CuSO4 = 63.5 g
Cu that can be obtained from 100 g of CuSO4
= 
= 39.81 g
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