How to calculate freezing point depression the ratio of the vapor pressure, osmotic pressure, molecular weight?

The dissolution of 5.25 g of a substance in 565 g of benzene at 298 K raises the boiling point of 0.625 oC. Note that Kf = 5.12 K kg mol-1, Kb = 2.53 K kg mol-1, and the density of benzene is 876.6 kg m-3. Calculate the freezing point depression, the ratio of the vapor pressure above the solution to that of the pure solvent, the osmotic pressure, and the molecular weight of the solute. Pbenzene* = 103 Torr at 298K.