If the overall mixture is 20% by mole R-245fa, will the mixture exist in one phase or multiple phases in equilibrium at 220 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 vapor phase
C. 1 liquid phase (x1 = 0.03) and 1 vapor phase (y1 = 0.37)
D. 2 liquid phases (x1? = 0.22; x1? = 0.92) and 1 vapor phase (y1 = 0.64)
E. 2 liquid phases (x1? = 0.13; x1? = 0.95)
A. Incorrect. The point is within the LLE dome, so two liquid phases exist.
B. Incorrect. 220 K is the base of the graph (x axis), which is well below the bubble point lines.
C. Incorrect. Since the point is below the bubble-point curve, no vapor phase will be stable.
D. Incorrect. The temperature (220 K) is below the VLLE temperature, so this is not the state of the system.
E. Correct. The point is inside the dome and the compositions are as identified.
?
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