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MHT CET20226 Aug 2022Evening ShiftChemistrySolutionsActual

Calculate the molar mass of solute when 1.5 gram nonvolatile solute dissolved in 100 ~mL solvent having density 0.8 ~g ~mL ⁻¹ lowers its freezing point by 0.75 ~K . (Freezing point depression constant for solvent is 5 ~K ~kg ~mol ⁻¹ )

Options

  1. A125 ~g ~mol ⁻¹
  2. B110 ~g ~mol ⁻¹
  3. C100 ~g ~mol ⁻¹
  4. D75 ~g ~mol ⁻¹

Correct answer

A. 125 ~g ~mol ⁻¹

Step-by-step solution

aligned & T_f=k_f W_B M_B 1000 W_A & 0.75=5 1.5 M_B 1000 80 & M_B=125 ~g / mol aligned

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