Practice question
Question
A 500 mL solution of KNO₃ has a molarity of 0.4 M and a density of 1.01 g/mL. What is the mass percentage of KNO₃? (Molar mass: KNO₃ = 101 g/mol)
Explanation
Moles = 0.4 × 0.5 = 0.2 mol; mass of KNO₃ = 0.2 × 101 = 20.2 g. Mass of solution = 500 × 1.01 = 505 g. Mass % = (20.2/505) × 100 ≈ 4%.
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