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Problem 4: A tank is filled with benzene and toluene. Both compounds reach equilibrium between the liquid phase and the vapor phase at T = 80° F. The liquid phase contains 30% mol of benzene, 70% mol of toluene. a) Calculate the vapor pressures of benzene and toluene at the given temperature (3 points) b) Calculate the partial pressures of benzene and toluene, and the total pressure of the system using Raoult's law (4 points) c) Calculate the vapor composition. (3 points) Benzene + Toluene Vapor Benzene + Toluene Liquid

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