Which of the following statements is true?
A. The system of n-hexane + benzene at low pressure would be well-modeled by Raoult’s Law since both of the components are hydrocarbons.
B. Most mixtures display positive deviations from Raoult’s Law.
C. It is quite rare to find a mixture that exhibits azeotropic behavior.
D. The bubble-point pressure of the system at a particular temperature can never be less than the vapor pressures of the pure components at that temperature.
E. None of the above are true.
A. Incorrect. Benzene is aromatic and planar; n-hexane is aliphatic and linear. These differences will cause significant deviations from ideal solution behavior and, hence, from an ideal solution.
B. Correct. Negative deviations are possible, but rare. The reasons are detailed in Section 10.2.
C. Incorrect. Azeotropes are quite common.
D. Incorrect. Systems that exhibit negative deviations to Raoult’s Law can have system pressures below either of the vapor pressures for the pure components.
E. Incorrect. One statement is true.
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