A binary liquid mixture exhibits vapor-liquid-liquid equilibrium at 250 K. The two liquid phases can be considered immiscible. Estimate the system pressure and vapor-phase composition if the vapor pressure of component 1 is 0.1 MPa and the vapor pressure of component 2 is 0.2 MPa.
A. P = 0.15 MPa; y1 = 0.500
B. P = 0.30 MPa; y1 = 0.500
C. P = 0.30 MPa; y1 = 0.333
D. P = 0.15 MPa; y1 = 0.333
E. P = 0.15 MPa; y1 = 0.667
A. Incorrect. Both values are incorrect. Reread Section 13.8.
B. Incorrect. You have correctly calculated the pressure, but the vapor is not equimolar.
C. Correct. The total system pressure is the sum of the two vapor pressures, and the mole fraction in the vapor-phase is the vapor pressure of the pure component divided by the system pressure.
D. Incorrect. You have the right idea for calculating the vapor composition, but the pressure is incorrect. Review Section 13.8
E. Incorrect. You might be mixing up component 1 and component 2 in calculating the mole fraction of the vapor phase. Review Section 13.8 on how to calculate the pressure.
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