# Pure cyclohexane has a freezing point of 6.50 C and a molalfreezing point constant (kf) of 20.2 C/m. You dissolve

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## Question:

Pure cyclohexane has a freezing point of 6.50 °C and a molalfreezing point constant (kf) of 20.2 °C/m. You dissolve 1.99 g ofan unknown solid into 50.0 g of cyclohexane. You determine that thefreezing point of the solution is -1.80 °C.

a. What is the freezing point depression (?Tf)?

b. What is the molality of the solution?

c. What is the molar mass of the unknown solute?

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