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Practice question

MCQ

Question

A 0.5 M solution of Na₂SO₄ (molar mass = 142 g/mol) has a density of 1.2 g/mL. What is the mass of the solute in 200 mL of this solution?

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Explanation

Moles of Na₂SO₄ = 0.5 × 0.2 = 0.1 mol . Mass of solute = 0.1 × 142 = 14.2 g . (Density is extra info, not needed for molarity-based calculation.)

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