Which of the following statements is false?
A. For a bubble-point pressure calculation, you will fix the system temperature and liquid-phase mole fraction.
B. When a system behaves according to Raoult’s Law, the bubble-point temperature curve (for a constant pressure system) will be a line.
C. Tie-lines are drawn horizontally between the bubble-point and dew-point curves, indicating the composition of the phases in equilibrium.
D. While not as common, some systems do show negative deviations from Raoult’s Law.
E. None of the above are false.
A. Incorrect. This is true. To find the bubble point pressure, you always fix the temperature. Because one degree of freedom remains, you must fix an additional intensive variable. We do not know the composition of the bubble, but do know the composition of the liquid. For a dew-point pressure calculation, we would fix T and yi.
B. Correct. Examine Figure 10-3 describing a Txy plot for a system behaving according to Raoult’s Law. The bubble-point curve is not a straight line.
C. Incorrect. This is true. Figure 10-11 shows some tie-lines drawn on a Pxy plot.
D. Incorrect. This is true. Certain systems have molecular interactions that will produce negative deviations from Raoult’s Law. These occur much less often than positive deviations.
E. Incorrect. One statement is incorrect. Try again.
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