Question

Calculate the mass percent of different elements present in sodium sulphate (Na₂SO4).

Answer 1

The molecular formula of sodium sulphate is (Na2SO4).

Molar mass = atomic mass of Na(23) + atomic mass of S(32.066) + atomic mass of O(16)

Molar mass of (Na2SO4) = [(2 × 23.0) + (32.066) + 4 (16.00)] = 142.066  

Mass percent of an element  

∴ Mass percent of sodium:  

Mass percent of sulphur:

Mass percent of oxygen: