How to Calculate Gibbs Free Energy (ΔG)
Evaluate thermodynamic feasibility step-by-step:
STEP 01
Enter Enthalpy ΔH
Input reaction enthalpy change in kJ/mol (negative for exothermic).
STEP 02
Enter Entropy ΔS
Input entropy change in J/(mol·K).
STEP 03
Enter Temperature T
Input absolute temperature T in Kelvin.
STEP 04
Compute ΔG
Subtract TΔS from ΔH to determine exergonic (ΔG < 0) spontaneity.
Key Features & Chemical Thermodynamics
Spontaneity Classifier
Classifies forward, reverse, or equilibrium state based on ΔG sign.
Equilibrium Temperature Solver
Calculates phase crossover temperature Teq = ΔH / ΔS.
Unit Auto-Conversion
Handles unit conversion between kJ (Enthalpy) and Joules (Entropy) automatically.
Thermodynamics Guide: Gibbs Free Energy (ΔG)
The Gibbs Free Energy (ΔG) combines the enthalpy and entropy of a system to predict whether a chemical process is thermodynamically favorable:ΔG = ΔH - T · ΔS
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Frequently Asked Questions
?What does ΔG = 0 signify?
When ΔG = 0, the system is at dynamic equilibrium, where forward and reverse reaction rates are equal (T_eq = ΔH / ΔS).