You know a particular system behaves according to Raoult’s Law. If the vapor pressure of pure component (1) at 343.15 K is 100 kPa; what could be the vapor pressure of pure component (2) at 343.15 K if you know the following: the system pressure at 343.15 K is 83.3 kPa when the vapor composition y1 = 0.8?
A. 200. kPa
B. 133. kPa
C. 79.1 kPa
D. 20.9 kPa
E. 16.7 kPa
A. Incorrect. You can find the liquid-phase composition when y1 = 0.8, and use that information (and the expression for the bubble-point pressure) to find the vapor-pressure for component 2.
B. Incorrect. You can find the liquid-phase composition when y1 = 0.8, and use that information (and the expression for the bubble-point pressure) to find the vapor-pressure for component 2.
C. Incorrect. You can find the liquid-phase composition when y1 = 0.8, and use that information (and the expression for the bubble-point pressure) to find the vapor-pressure for component 2.
D. Incorrect. You can find the liquid-phase composition when y1 = 0.8, and use that information (and the expression for the bubble-point pressure) to find the vapor-pressure for component 2.
E. Correct. You can find the liquid-phase composition when y1 = 0.8, and use that information (and the expression for the bubble-point pressure) to find the vapor-pressure for component 2.
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