For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system _____________ as its mole fraction increases?
Correct answer: B. Increases
- A. Decreases
- B. Increases
- C. Remain same
- D. Decreases linearly
Explanation
At fixed temperature and pressure, increasing a component's mole fraction in a stable phase increases its chemical potential and hence its fugacity. The activity coefficient may vary, but phase stability ensures the corresponding fugacity change is increasing.
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