#KNO₃

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Total mass = 10.1 + 39.9 = 50 g. Mass % = (10.1/50) × 100 = 20.2%.

Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals

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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%.

Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Concentration Terms - Molarity Molality and Mole Fraction

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