Answer the following statement(s) true (T) or false (F)
Which of the following statements about the modified Raoult’s Law is true?
A. The activity coefficient of both components in a binary mixture will be greater than 1.
B. The liquid phase must behave according to the ideal solution model.
C. For a system behaving according to the modified Raoult’s law where the activity coefficients are not equal to 1, the bubble-point pressure will be a line connecting the vapor pressures of the pure components.
D. The system pressure is low enough to assume that the ideal gas model is valid for the vapor phase.
E. None of the above are true.
A. Incorrect. This does not have to be true. Both could be less than one (negative deviations).
B. Incorrect. The modification to Raoult’s Law is to account for the fact that the liquid phase is NOT an ideal solution.
C. Incorrect. This is true for Raoult’s Law, but does not apply when the solution is not ideal (when the activity coefficients are not equal to 1).
D. Correct. The modifications to Raoult’s Law here focus solely on the liquid solution. The vapor phase is still assumed to be an ideal gas in modified Raoult’s Law.
E. Incorrect. One statement is accurate. Review Section 11.5 if you are unable to determine which one.
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