Ideal Gas Gibbs Free Energy Formula:
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Definition: This calculator computes the Gibbs free energy of an ideal gas mixture in a binary system using the ideal gas mixture model.
Purpose: It helps chemical engineers and researchers determine the thermodynamic properties of ideal gas mixtures.
The calculator uses the formula:
Where:
Explanation: The first term represents the weighted average of pure component Gibbs energies, while the second term accounts for the entropy of mixing.
Details: Gibbs free energy determines the spontaneity of chemical processes and phase equilibria in thermodynamic systems.
Tips: Enter mole fractions (must sum to 1), component Gibbs energies, and temperature. All values must be valid (temperature > 0, 0 ≤ mole fractions ≤ 1).
Q1: Why do we take the absolute value of the result?
A: The modulus ensures we get a positive value for Gibbs free energy, which is more meaningful in most thermodynamic analyses.
Q2: What if my mole fractions don't sum to 1?
A: The calculator will still compute a result, but for accurate thermodynamics, mole fractions should properly sum to 1.
Q3: What units should I use?
A: Use consistent units: Joules for energy, Kelvin for temperature, and dimensionless for mole fractions.
Q4: Can this be extended to multicomponent systems?
A: Yes, the formula generalizes to \( G^{ig} = |\sum y_iG_i^{ig} + RT\sum y_i\ln y_i| \) for any number of components.
Q5: When is the ideal gas assumption valid?
A: At low pressures and high temperatures where intermolecular forces become negligible.