At 300k and at a total pressure of 35.5 kpa, the composition of the system ethanol (1) and toluene (2) at equilibrium is x, = 0.35 and y, = 0.78.the saturation pressure at the given temperature for pure components are p = 45.05 kpa and p, = 10 kpa respectively. calculate the liquid phase activity coefficients and the value rt .) ; , = 1.55,7 =17 -0.413 b) 7 = 1.95,7 = 1 c) 7 = 1.25.7 d) 7, = 1.75