Q. 24.3( 361 Votes )
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
Percentage of Sodium in sodium sulphate = [46×100]/142
Percentage of Sulphur in sodium sulphate = [32×100]/142
Percentage of Oxygen in sodium sulphate = [64×100]/142
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