Consider the following data at 298.15 K: Psat (1) = 50 kPa; Psat (2) = 150 kPa. If the liquid behaves as an ideal solution, what can you say about the properties of this mixture?
A. When the liquid is very rich in component (2), the bubble-point pressure approaches 50 kPa.
B. The azeotrope for this system will occur when the system is equimolar.
C. The bubble-point pressure of an equimolar mixture will be 100 kPa at 298.15 K.
D. The system likely has an excess molar enthalpy in the 50 to 150 J/mol range.
E. All of the above are true.
A. Incorrect. When the liquid is rich (highly concentrated) in component 2, the bubble-point pressure should be close to 150 kPa.
B. Incorrect. Ideal solutions do not form azeotropes.
C. Correct. The bubble-point pressure from an ideal solution is a straight line between the two pure component vapor pressures. At x1 = x2 = 0.5, this is (50 kPa + 150 kPa)/2 = 100 kPa
D. Incorrect. If the solution is an ideal solution, then the excess enthalpy is zero for all compositions.
E. Incorrect. One statement is true.
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