1. What is Fugacity?

Definition: Fugacity is a thermodynamic property of a real gas which if substituted for the pressure in the equations for an ideal gas gives equations applicable to the real gas.

Purpose: It helps in the study of real gases and their deviations from ideal behavior, particularly in chemical thermodynamics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( f \) — Fugacity (Pa)
• \( P \) — Pressure (Pa)
• \( G^R \) — Residual Gibbs Free Energy (J)
• \( R \) — Universal gas constant (8.314 J/mol·K)
• \( T \) — Temperature (K)

Explanation: The formula accounts for the non-ideal behavior of gases by incorporating the residual Gibbs free energy.

3. Importance of Fugacity Calculation

Details: Fugacity is crucial in phase equilibrium calculations, chemical reaction equilibria, and in predicting the behavior of real gases.

4. Using the Calculator

Tips: Enter the pressure in Pascals, residual Gibbs free energy in Joules, and temperature in Kelvin. Temperature must be > 0K.

5. Frequently Asked Questions (FAQ)

Q1: What is residual Gibbs free energy?
A: It's the difference between the Gibbs free energy of a real system and that of an ideal system at the same temperature and pressure.

Q2: Why use fugacity instead of pressure?
A: Fugacity accounts for non-ideal behavior of real gases, making thermodynamic calculations more accurate.

Q3: What's the value of the universal gas constant?
A: The calculator uses R = 8.31446261815324 J/mol·K.

Q4: Can I use this for liquids?
A: The concept of fugacity applies to liquids as well, but the calculation method might differ.

Q5: How does temperature affect fugacity?
A: Higher temperatures generally increase fugacity, but the exact relationship depends on the specific system.