Practice question
Question
A solution of KOH has a density of 1.1 g/mL and a molarity of 2 M. What is its molality? (Molar mass: KOH = 56 g/mol)
Explanation
Mass of 1 L solution = 1000 × 1.1 = 1100 g. Mass of KOH = 2 × 56 = 112 g. Mass of water = 988 g = 0.988 kg. Molality = 2 / 0.988 ≈ 2.02 m.
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