Tom determines the molar mass of an unknown. He first found the freezing point of the ice/DI H2O mixture to be 0.51 degrees celsius but when he added 11.3g of the unknown sample to the mixture, the freezing point dropped to -5.63 degrees celsius upon several minutes of stirring. Tom poured off the solution and determined its mass to be 117.6g.

1. What was the freezing point depression?

2. What was the molality of the unknown using change Tr= mkf

3. How much unknown was in the decanted solution?