56. Solving a chemistry problem

68.4 g of sucrose dissolved in 1000 g of water. Calculate: a) vapor pressure, b) osmotic pressure, c) freezing point, r) boiling point of the solution. The vapor pressure of pure water at 20 °C is 2314.9 Pa. The cryoscopic and ebullioscopic constants of water are 1.86 and 0.52 K.kg•mol-1, respectively.