A 0.2436-g sample of an unknown substance was dissolved in 20.0 ml of cyclohexane. The density of cyclohexane is 0.779 g/ml. The freezing-point depression was 2.5°C. Calculate the molar mass of the unknown substance. (The unit is g/mol with 3 sf) The molar freezing point depression constant for cyclohexane is 20.5°C/m.
