Question

Calculate the mass percentage of Na,S and O in Na2SO4.

Answer 1

molar mass of Na2So4 = 23×2 + 32 + 16×4 = 142

mass % of Na = 46/142 × 100 = 32.39%

mass % of S = 32/142 × 100 = 22.53%

mass % of O = 64/142 × 100 = 45.07%

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