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Practice question

MCQ

Question

A 400 mL solution of HCl has a molarity of 0.25 M and a density of 1.01 g/mL. What is the mass percentage of HCl? (Molar mass: HCl = 36.5 g/mol)

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Explanation

Moles = 0.25 × 0.4 = 0.1 mol; mass of HCl = 0.1 × 36.5 = 3.65 g. Mass of solution = 400 × 1.01 = 404 g. Mass % = (3.65/404) × 100 ≈ 0.904%.

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