You know a particular system behaves according to Raoult’s Law. If the vapor pressure of the pure components at 303.15 K are as follows, Psat (1) = 75 kPa; Psat (2) = 125 kPa, what will be the system pressure and vapor phase composition when the system is at VLE with x1 = 0.300 and T = 303.15 K.
A. P = 75 kPa; y1 = 0.205
B. P = 125 kPa; y1 = 0.205
C. P = 110 kPa; y1 = 0.205
D. P = 110 kPa; y1 = 0.341
E. P = 110 kPa; y1 = 0.300
A. Incorrect. The system pressure in an ideal solution or Raoult’s Law solution will only equal the pure component pressure when the entire system is the pure component. See Equation 10.1.
B. Incorrect. The system pressure in an ideal solution or Raoult’s Law solution will only equal the pure component pressure when the entire system is the pure component. See Equation 10.1.
C. Correct. Using Equation 10.1 and Equation 10.4, you arrive at these numbers.
D. Incorrect. You are using the correct equation, but have inserted the wrong values. Review your work and try again with the correct numbers.
E. Incorrect. Your pressure calculation is correct, but the vapor-phase composition will not be equal to the liquid-phase composition.
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