Question

How many grams of copper will get replaced in 2 L of CuSO₄ solution having molarity 1.50 M, if it is made to react with 54 g of aluminium? (At. mass of Cu = 63.5 and AI = 27.0)

Answer 1

The reaction with CuSO₄ solution and aluminium may be represented as 3CUSO₄ + 2Al → Al₂(SO₄)₂ +3CU (3 × 159.5)g = 478.5g (2 × 27)g = 54g 

Calculation of wt. of CuSO₄ in 2 L of CuSO₄ solution having 1.50 molarity

478.5 g of CuSO₄ reacts with 54 g of aluminium 

Also, 159.5 g of CuSO₄ has 63.5 g of Cu 

1 g of CuSO₄ has 63.5/159.5 g of Cu 

478.5 g of CuSO₄ has 63.5/159.5 × 478.5 g of Cu = 190.5 g of Cu