Question

how much copper can be obtained from 100 grams of copper sulphate

Answer 1

the molar mass of CuSO4 (anhydrous) is 159.5 g
i.e mass of 1 mole of CuSO4 is  159.5 g 

therefore  159.5 g (1 mole) of CuSO4 will produce 1 mole of Cu
 
And the mass of 1 mole of Cu is 63.5 g


therefore,           159.5 g of CuSO4  =  63.5 g of Cu
  hence,                100g  of CuSO4   =   63.5 * 100 g of Cu
                                                                     159.5
                                                            =39.8g of Cu

Answer : Amt of Cu obtained from 100 g CuSO4 = 39.8 g.