Calculate Gibbs free energy, enthalpy, entropy, temperature, and equilibrium constants for chemical reactions. Perfect for thermodynamics, chemical equilibrium, and reaction spontaneity calculations.
Gibbs Free Energy Calculator
About Gibbs Free Energy
Formula
ΔG = ΔH - TΔS
Where R = Gas constant (8.314 J/mol·K)
Key Concepts
Gibbs Free Energy (ΔG): Maximum useful work obtainable from a process
Enthalpy (ΔH): Heat content change of the system
Entropy (ΔS): Measure of disorder or randomness
Temperature (T): Absolute temperature in Kelvin
Spontaneity Rules
ΔG < 0: Reaction is spontaneous
ΔG > 0: Reaction is non-spontaneous
ΔG = 0: Reaction is at equilibrium
How to Use
Select the calculation type you want to perform
Enter the required values based on your calculation
Choose appropriate units for your inputs
Click Calculate to get the result
Common Applications
Predicting reaction spontaneity
Calculating equilibrium constants
Phase transition analysis
Electrochemical cell potentials
Biochemical reaction analysis
Example Values
Water freezing: ΔH = -6.02 kJ/mol, ΔS = -22.1 J/mol·K
Water boiling: ΔH = 40.7 kJ/mol, ΔS = 109 J/mol·K
Standard conditions: T = 298.15 K (25°C)
Important Notes
Temperature must be positive (Kelvin scale)
Standard temperature is 298.15 K (25°C)
Units are automatically converted for calculations