Who doesn’t like multiple choice? Here are some questions that relate to thermod
ID: 980634 • Letter: W
Question
Who doesn’t like multiple choice? Here are some questions that relate to thermodynamic properties and thermodynamic functions. Indicate the letter of the correct answer.
(a) In a simple one-component system, the maximum number of phases that can coexist at constant temperature and pressure depends upon (A) the number of different solid forms, (B) depends upon the nature of the element, or (C) is fixed at three.
(b) Assume that for a system of one mole of pure substance A at fixed temperature T and fixed pressure P the chemical potential of A is 42.31 kJ. If one now has a system of ten moles of pure A at the same temperature T and fixed pressure P, the chemical potential of pure A will be: (A) 423.1 kJ, (B) 42.31 kJ, or (C) cannot be determined from the given information.
(c) If pure A exists in the form of a gas at fixed temperature T, and the gas is ideal, then the chemical potential of the gas will be highest when the gas pressure is: (A) 1 atmosphere, (B) 3.72 atmospheres, or (C) 10 atmospheres.
(d) Assume that at fixed temperature, T, the pressure of the vapor of A in equilibrium with pure solid A is 1.3×10-6 atm. If the vapor pressure of A in equilibrium with pure liquid A were also 1.3×10-6 atm, we could conclude that (A) pure solid A is more stable than pure liquid A, (B) pure liquid A is more stable than pure solid A, or (C) we are at the triple point.
(e) Increases in temperature at constant pressure tend to stabilize phases that have a (A) high melting temperature, (B) a high entropy, or (C) a small molar volume.
Explanation / Answer
ANSWER
(a) Option (C) is correct answer. For one component at triple point system is invariable
(b) Option (B) is correct answer. Chemical potential is energy of one mole of substance at given T and P. It does It is fixed at given T and P.
(c) Option (C) is correct answer.
(d) Option (C) is correct answer. All the phases have same vapour pressure at triple point.
(e) Option (C) is correct answer.
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