Answer the following statement(s) true (T) or false (F)

Question

A. A mixture of ethanol + ethane will exhibit cross-association interactions, where a hydrogen-atom on the ethane will hydrogen-bond with the oxygen atom on the ethanol
B. If a mixture forms an azeotrope, it will show an azeotrope at all temperatures where vapor-liquid phase equilibrium can exist for the system.
C. In retrograde condensation, as the system pressure is decreased, more of the liquid phase (relative to the vapor phase) will form.
D. The lever rule is generally more accurate than performing material balance calculations to determine the amounts of the phases in equilibrium since you are able to measure the distances using a ruler.
E. None of the above are true.

Answer 1

A. Incorrect. An ethanol molecule will hydrogen bond to other ethanol molecules, while the ethane will not.
B. Incorrect. The azeotropic composition is a function of temperature or pressure, so changes in those variables can cause the azeotrope to move, potentially resulting in a zeotropic mixture.
C. Correct. This counterintuitive nonideality is shown in Figure 10-11 and surrounding text.
D. Incorrect. Using a ruler on a graph introduces unavoidable errors that are not present when using data (such as material flowrates, masses, and compositions). If data is present that allows you to do direct phase composition calculations, use it in preference to graphs.
E. Incorrect. One of the statements is true.