Which of the following statements is true?
A. When we use the term “volatile”, we are saying that the more volatile component in a mixture will appear preferentially in the vapor phase, relative to the overall composition of the mixture.
B. You cannot obtain pure component property information from a Txy or Pxy diagram.
C. Almost always, the vapor phase composition will be the same as the liquid phase composition for a mixture in vapor-liquid equilibrium (VLE), with but a few exceptions.
D. The phase present above the curve on a Txy plot is a single liquid phase.
E. None of the above are true.
A. Correct. Volatility in a mixture is a comparison between the two substances’ movement into the vapor phase with addition of heat, or removal of pressure.
B. Incorrect. The pure component property (Tsat or Psat) of each substance can be read by finding where the mole fraction is equal to 0 or 1.
C. Incorrect. This occurrence happens only at certain conditions and is named an azeotrope. While common, they are not the near universal occurrences this statement suggests.
D. Incorrect. The phase present above the Txy curve is a single vapor phase. The phase present above the curve on a Pxy plot is a single liquid phase.
E. Incorrect. One statement is true.
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