3. The Txy equilibrium diagram for the (benzene + toluene) system at atmospheric pressure is given below. a) At what temperature will an equimolar liquid mixture of benzene and toluene begin to boil at 1 atm? What is the mole fraction of benzene in the first bubble? b) At what temperature will an equimolar vapor mixture of benzene and toluene at 1 atm begin to condense? What is the mole fraction of benzene in the first drop of condensate? c) What happens to the system temperature as the condensation proceeds? 115 110 105 100 95 90 85 80 75 0.2 0.4 0.6 0.8 Mole fraction benzene Temperature / °C

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