Practice question
Question
A solution of HNO₃ has a molarity of 1.5 M and a density of 1.05 g/mL. What is its molality? (Molar mass: HNO₃ = 63 g/mol)
Explanation
Mass of 1 L solution = 1000 × 1.05 = 1050 g. Mass of HNO₃ = 1.5 × 63 = 94.5 g. Mass of water = 955.5 g = 0.9555 kg. Molality = 1.5 / 0.9555 ≈ 1.57 m.
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