If the overall composition of a binary mixture at a given temperature and pressure falls within the vapor-liquid equilibrium curve (either Txy or Pxy), what do you know about this mixture?
A. Component (2) is more volatile than component (1).
B. The mixture does not obey Raoult’s Law.
C. The system must possess an azeotrope.
D. If you move horizontally on the figure in both directions, the points where the intersections with the curves occur are two compositions that are in vapor-liquid equilibrium.
E. The system does not behave as an ideal solution.
A. Incorrect. We do not have enough information to make this conclusion.
B. Incorrect. We do not have enough information to make this conclusion. We would need the equilibrium data and the system pressure to evaluate if we have an ideal solution and an ideal gas.
C. Incorrect. We do not have enough information to make this conclusion.
D. Correct. This is the way to read the compositions of VLE vapors and liquids off a Txy or Pxy chart. This line is called the “tie-line”.
E. Incorrect. We do not have enough information to make this conclusion. We would at least need to know the components in the system.
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