Freezing Point Depression: Molar Mass of a Solid Pre-Lab Assignment 1. What is the kr for cyclohexane? 2. What mass of unknown solid will you add? 3. A 0.194 g sample of an unknown solid is dissolved in 9.82 g of cyclohexane. The change in the freezing point of the solution is 2.94°C. a. What is the molality of the solute in the solution? b. Calculate the molar mass of the solute.