Question

Calculate the percentage of oxygen in blue vitriol (Cu = 64).

Answer 1

Explanation:

The molecular weight of water H 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= 2505×18 ×100=36%.