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MHT CET202618 April 2026Morning ShiftChemistrySolutionsActual

Calculate the molality of solution of nonvolatile solute if boiling point of solution, molal elevation constant for solvent are 319.8 K and 2.5 K kg mol ⁻¹ respectively [Boiling point of solvent = 319.5 K ]

Options

  1. A0.12 mol kg ⁻¹
  2. B0.14 mol kg ⁻¹
  3. C0.17 mol kg ⁻¹
  4. D0.21 mol kg ⁻¹

Correct answer

A. 0.12 mol kg ⁻¹

Step-by-step solution

Elevation in boiling point is given by T_b = T_b - T_b^ Substituting the given values: T_b = 319.8 - 319.5 = 0.3 K The relation between elevation in boiling point and molality is T_b = K_b m Rearranging for molality m : m = T_b K_b m = 0.3 2.5 = 0.12 mol kg ⁻¹ Answer: 0.12 mol kg ⁻¹

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