Practice question
Question
A 0.4 M solution of KNO₃ (molar mass = 101 g/mol) has a density of 1.1 g/mL. What is the mass percentage of KNO₃ in 250 mL of this solution?
Explanation
Moles = 0.4 × 0.25 = 0.1 mol . Mass of KNO₃ = 0.1 × 101 = 10.1 g . Total mass = 250 × 1.1 = 275 g . Mass % = (10.1/275) × 100 ≈ 3.673% .
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