The composition of vapor entering a tray in a distillation column is 0.57. The average composition of the vapor leaving the tray is 0.65. The equilibrium composition of the vapor corresponding to the...

Extracted text: The composition of vapor entering a tray in a distillation column is 0.57. The average composition of the vapor leaving the tray is 0.65. The equilibrium composition of the vapor corresponding to the liquid leaving this tray is 0.60. All the compositions are expressed in mole fraction of the more volatile component. Calculate the Murphree efficiency based on the vapor phase is -----% a)150 b)280 c)120 d)266