The fugacity coefficient of a substance represents the ratio of its fugacity to__________________?
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Answer: C. Pressure
Explanation
Mathematical definitions establish the fugacity coefficient as the direct ratio of fugacity to pressure. This dimensionless ratio quantifies how much a real gas departs from ideal gas behavior. Dividing the fugacity by the actual pressure yields the exact value of this coefficient. Fugacity has units of pressure and replaces it in equilibrium constant expressions. The coefficient approaches unity as pressure approaches zero for any real gas. Thermodynamic tables list these coefficients for various gases across multiple temperatures.
Engineers apply this coefficient when predicting vapor-liquid equilibrium in distillation columns. It helps calculate chemical potential changes in complex industrial reaction mixtures. Monitoring this ratio ensures accurate modeling of high-pressure petroleum reservoirs. Mole fractions measure composition rather than acting as a denominator for this coefficient. Activity coefficients apply primarily to liquid and solid solution components instead. Pressure serves as the correct denominator in the mathematical ratio defining this coefficient.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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