# Calculate the mass per cent of different elements present in sodium sulphate (Na2SO4).

Atomic Mass of Sodium = 23g

Atomic Mass of Sulphur = 32g

Atomic Mass of Oxygen = 16g

From the molecular formula of sodium sulphate, it is understood that in 1 mole of sodium sulphate, 1 mole of sulphur, 4 moles of oxygen and 2 moles of sodium is present.

So Molecular Mass of Sodium Sulphate = [23×2] + [32×1] + [16×4]

= 46 + 32 + 64

= 142g

Percentage of Sodium in sodium sulphate = [46×100]/142

= [4600/142]

= 32.394%

Percentage of Sulphur in sodium sulphate = [32×100]/142

= 3200/142

= 22.535%

Percentage of Oxygen in sodium sulphate = [64×100]/142

= 6400/142

=45.070%

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