Practice question
Question
A solution of H₂SO₄ has a molarity of 0.5 M and a density of 1.03 g/mL. What is its molality? (Molar mass: H₂SO₄ = 98 g/mol)
Explanation
Mass of 1 L solution = 1000 × 1.03 = 1030 g. Mass of H₂SO₄ = 0.5 × 98 = 49 g. Mass of water = 981 g = 0.981 kg. Molality = 0.5 / 0.981 ≈ 0.51 m.
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