Practice question
Question
A 500 mL solution of H₂SO₄ has a molarity of 0.2 M and density 1.02 g/mL. What is the mass percentage of H₂SO₄? (Molar mass: H₂SO₄ = 98 g/mol)
Explanation
Moles = 0.2 × 0.5 = 0.1 mol; mass of H₂SO₄ = 0.1 × 98 = 9.8 g. Mass of solution = 500 × 1.02 = 510 g. Mass % = (9.8/510) × 100 ≈ 1.92%.
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