申論題

11.At high temperature, a system at 1 bar is in gas phase with three components: A, B, and C in a molar
ratio of 2:1:2. The temperature goes down at a fixed pressure of 1 bar, and we observe that the bubble point
occurs at 49 'C. The vapor pressures of the three species are the following

where the pressure is in a unit of bar and temperature is in a unit of K.

b. Please determine the mole fraction of B in vapor phase at the bubble point.Note: A, B, and C may or may not be miscible in liquid phase. You can assume Raoult's Law applies for any homogeneous liquid mixture that may exist in this system. Your answer should be based on the calculation. A random guess will get no credit.