Question

A solution is made by dissolving 41.1 g urea (CH N20), a nonelectrolyte, in 275 g water. Calculate the vapor pressure of this solution at 25°C and 45°C. 25°C 45°C vapor pressure of water 23.8 torr 71.9 torr vapor pressure at 25°C vapor pressure at 45°C -

Answer 1

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Given Drea is non volatile solute. mole of urega 41.49M 0685 mole Gogomy, DBH mole of HO = 275 gm - 15.28 mole C 189 m/mot (2 Total mole z 15.28 +0.685 = 15.97mole mole fraction of ho= mole of 42 15.28 I totalmole 15.97 ato = 0.957. | According to Rault's low Psolution = PHOXX 1.0 solution 3 23.8 toro x 0.957 at 25°C = 22.78 torn Similarly at 45°c 371.9 torr *0.957. Solution at 45°C 368.81 toor 1 Scanned with CamScanner