Ideal Gas Gibbs Free Energy Formula:
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Definition: Ideal Gas Gibbs Free Energy is the Gibbs energy in an ideal condition, calculated using the Gibbs free energy of a real system, temperature, and the fugacity-pressure ratio.
Purpose: This calculation helps in thermodynamics to determine the difference between real and ideal gas behavior.
The calculator uses the formula:
Where:
Explanation: The formula calculates the difference between real Gibbs energy and the correction term for non-ideality.
Details: Understanding the ideal gas Gibbs free energy helps in chemical process design, phase equilibrium calculations, and predicting chemical reaction behavior.
Tips: Enter the Gibbs free energy (J), temperature (K), fugacity (Pa), and pressure (Pa). Temperature and pressure must be > 0.
Q1: What is fugacity?
A: Fugacity is a thermodynamic property of a real gas which if substituted for the pressure in equations for an ideal gas gives equations applicable to the real gas.
Q2: Why do we need this calculation?
A: It helps quantify the deviation of real gases from ideal behavior in thermodynamic calculations.
Q3: What units should I use?
A: Use consistent SI units: joules for energy, kelvin for temperature, and pascals for pressure and fugacity.
Q4: Can I use different pressure units?
A: Yes, but ensure fugacity and pressure use the same units for proper ratio calculation.
Q5: What does a negative result mean?
A: A negative result indicates the ideal gas state has lower Gibbs free energy than the real system at the given conditions.