Practice question
Question
A solution of HCl has a molarity of 2 M and a density of 1.06 g/mL. What is its molality? (Molar mass: HCl = 36.5 g/mol)
Explanation
Mass of 1 L solution = 1000 × 1.06 = 1060 g. Mass of HCl = 2 × 36.5 = 73 g. Mass of water = 987 g = 0.987 kg. Molality = 2 / 0.987 ≈ 2.03 m.
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