If the overall mixture is 20% by mole R-245fa, will the mixture exist in one phase or multiple phases in equilibrium at 240 K and 0.1 bar according to the model? If the mixture does exist in multiple phases, what is the composition of the equilibrium phases?
Consider a model that predicts the behavior of the R-245fa (1) + isopentane (2) system at two pressures shown in the figure.
A. 1 liquid phase
B. 1 liquid phase (x1 = 0.03) and 1 vapor phase (y1 = 0.37)
C. 2 liquid phases (x1? = 0.22; x1? = 0.92) and 1 vapor phase (y1 = 0.64)
D. 2 liquid phases (x1? = 0.22; x1? = 0.92)
E. 2 vapor phases
A. Incorrect. We are below the dew-point curve, but above the bubble point curve, at 0.1 bar, so this is not one liquid phase.
B. Correct. The point is between the dew- and bubble-point curves, so one liquid and one vapor phase will exist. Drawing a horizontal tie line at that point will provide the correct liquid and vapor phases
C. Incorrect. VLLE occurs ONLY when the system is located on the red horizontal line separating the LLE region from the VLE region. This occurs a little above 230 K.
D. Incorrect. We are above the bubble-point curve, so there must be at least one vapor phase.
E. Incorrect. Nothing indicates vapor-vapor equilibrium.
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