Free Gibbs Free Energy Calculator
Calculate Gibbs free energy change (ΔG) from enthalpy change (ΔH), entropy change (ΔS), and temperature to determine reaction spontaneity.
kJ
J/K
K
Gibbs Free Energy (ΔG)
-85.10 kJ
Gibbs Free Energy (ΔG) vs Enthalpy Change (ΔH)
Gibbs Free Energy
Formula
ΔG = ΔH − TΔS
Where:
If ΔG < 0, the reaction is spontaneous. If ΔG > 0, it is non-spontaneous. If ΔG = 0, the system is at equilibrium.
Example Calculation
A reaction with ΔH = -100 kJ and ΔS = -50 J/K at 298 K.
- 01ΔG = ΔH - TΔS
- 02ΔG = -100 - (298 × (-50)/1000)
- 03ΔG = -100 - (-14.9)
- 04ΔG = -100 + 14.9
- 05ΔG = -85.1 kJ (spontaneous)
Frequently Asked Questions
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