100 mol/min of an equimolar mixture of A and B is separated in a two stage evaporation process. In the first stage, the liquid and vapor flow rates exiting the stage are each 50 mol/min. The liquid phase effluent from the first stage is fed to a second stage that operates at the same temperature as the first stage. The effluent flow rates of the liquid and vapor phases from the second stage are 25 mol/min each. The vapor phase effluent from the second stage is combined with the vapor phase effluent from the first stage. At the temperature that both stages are operating at, the vapor pressure of A is 10 kPa and the vapor pressure of B is 100 kPa. The liquid and vapor phases leaving each unit are in equilibrium. Find the composition of each stream and the pressure at each stage.