Question

What is the molality of a naphthalene-in-benzene-solution with the same freezing point as a 0.55 m sucrose in H2O? (For H2O: Kf = 1.86 For Benzene: Kf = 5.12, Freezing point = 5.52 degrees C)

Answer 1

i would go like this: first find the freezing point depression of the sucrose solution, and from that the freezing point of the sucrose solution. that's going to be the same as the freezing point of the nap solution. so this tells us the freezing point depression of the nap solution, and we can relate it to the molality of nap in benzene.