When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is__________________?
Correct answer: C. Same in both the phases
- A. More in vapour phase
- B. More in liquid phase
- C. Same in both the phases
- D. Replaced by chemical potential which is more in vapour phase
Explanation
At phase equilibrium, there is no driving force for transfer of the component between phases, so its chemical potential, equal to its molar Gibbs free energy for a pure phase, is the same in both phases. A difference would cause material to move toward the phase with lower chemical potential.
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