Calculation of Molal Freezing Point Depression Constant


1.60 g of naphthalene (C10H8) is dissolved in 20.0 g of benzene. The freezing point of pure benzene is 5.5 oC, and the freezing point of the mixture is 2.8 oC. What is the molal freezing point depression constant, Kf of benzene?


  1. Step 1: Calculate the freezing point depression of benzene.

    deltaTf = (Freezing point of pure solvent) - (Freezing point of solution)

    (5.5 oC) - (2.8 oC) = 2.7 oC

  2. Step 2 : Calculate the molal concentration of the solution.

  3. Step 3: Calculate Kf of the solution.


Show completed problem

General Chemistry Help HomepageGen Chem Topic Review