Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature ____________ as its mole fraction increases?
Correct answer: D. Increases
- A. Decreases
- B. Decreases exponentially
- C. Remain constant
- D. Increases
Explanation
In a stable homogeneous solution, increasing a component's mole fraction increases its chemical potential and hence its fugacity at fixed temperature and pressure. For an ideal gas mixture this reduces to f_i = y_iP, which makes the trend especially clear.
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