Gibbs Free Energy Calculator

Calculate Gibbs free energy (G) for determining spontaneity and equilibrium of processes at constant T and P.

Calculation Type

Enthalpy Change ΔH (kJ/mol)

Entropy Change ΔS (J/(mol·K))

Temperature (K)

Gibbs Free Energy Change ΔG: -40.4000 kJ/mol

Spontaneity: Spontaneous

Enthalpy term (ΔH): -100.0000 kJ/mol

Entropy term (TΔS): -59.6000 kJ/mol

Equilibrium Temperature: 500.00 K

Definition: G = H - TS

Change: ΔG = ΔH - TΔS

Equilibrium constant: ΔG° = -RT ln(K)

Pressure dependence: G(P₂) - G(P₁) = nRT ln(P₂/P₁)

Spontaneity at constant T, P:

ΔG < 0: Spontaneous

ΔG = 0: Equilibrium

ΔG > 0: Non-spontaneous