1.

Calculate the mass percentage of different elements present in sodium sulphate.

Answer»

Molecular mass of sodium sulphate (Na2SO4) is 142 g mol.
The elements present in sodium sulphate are sodium, sulphur and oxygen.
Mass of Sodium : 23  × 2 = 46 g
Mass of Sulphur : 32  × 1 = 32 g
Mass of Oxygen : 16  × 4 = 64 g
Mass percentage of sodium = \(\frac{32}{142}\)  × 100
= 32.38 or 32.4%
Mass percentage of sulphur = \(\frac{32}{142}\) × 100
= 22.57 or 22.6
Mass percentage of oxygen = \(\frac{64}{142}\) × 100 .
= 45.05%


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