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MHT CET20226 Aug 2022Morning ShiftChemistrySolutionsActual

What is the molar mass of solute when 5 gram solute dissolved in 70 gran solvent lowers its freezing point by 2.5 ~K ? If K _ f =3.5 ~K - Kg / mol .

Options

  1. A100 ~g ~mol ⁻¹
  2. B120 ~g ~mol ⁻¹
  3. C160 ~g ~mol ⁻¹
  4. D140 ~g ~mol ⁻¹

Correct answer

A. 100 ~g ~mol ⁻¹

Step-by-step solution

T _ f = K _ f m 2.5=3.5 5 M 1000 70 M =100 ~g / mol

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