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15 ppm = 15 g CHCl₃ in 10⁶ g water. Moles = 15/119.5 ≈ 0.1255 mol. Mass of solvent = 1000 kg. Molality = 0.1255/1000 ≈ 1.255 × 10⁻⁴ m.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Concentration Terms - Molarity Molality and Mole Fraction
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