Free Equilibrium Constant Calculator
Calculate the equilibrium constant (K) from the standard Gibbs free energy change (ΔG°) and temperature using ΔG° = -RT ln(K).
kJ/mol
K
Equilibrium Constant (K)
56.6114
Equilibrium Constant (K) vs Standard ΔG°
Equilibrium Constant from ΔG°
Formula
K = e^(−ΔG° / RT)
Equivalently: ΔG° = −RT ln(K)
Where:
Large K (K >> 1) means products are favored. Small K (K << 1) means reactants are favored.
Example Calculation
A reaction with ΔG° = -10 kJ/mol at 298 K.
- 01K = e^(-ΔG°/RT)
- 02K = e^(-(-10000)/(8.314 × 298))
- 03K = e^(10000/2477.6)
- 04K = e^(4.036)
- 05K = 56.6
Frequently Asked Questions
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