Hence if the molar mass increases by a factor of 4 at

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Unformatted text preview: ondensation of a gas both the pressure and the temperature remain constant. This is true and corresponds to the horizontal section of the condensation isotherm in a P vs. Vm plot, where the liquid and vapor phases coexist. Think also about the boiling of water at ambient pressure. b) A unique molar volume characterizes the system at all stages of the condensation of a gas into a liquid. This is incorrect. Indeed while the pressure and the temperature remain constant during condensation, indicating that two phases are in equilibrium, two different molar volumes are needed to characterize the system. These are the molar volume of the liquid phase and the molar volume of the vapor phase. c) The compressibility factor is larger than one above the Boyle’s temperature and less than one below. This statement is also incorrect. The statement would have been correct if the word compressibility had been replaced by the word compression. Remember Z > 1 when repulsive forces are predominant. d) On a compression isotherm, the first droplet of liquid is observed at a molar volume higher than the critical molar volume. This is true, since the critical point is located at a molar volume that is always intermediate between the molar volumes of the liquid and vapor phases in equilibrium with each other at any temperature. Question 7: (5 points) Indicate which of the following statements is incorrect: a) In a mixture A/B of ideal gases, the ratio...
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