Gibbs Free Energy Calculator

About the Gibbs Free Energy Calculator

The Gibbs Free Energy Calculator allows you to quickly determine the spontaneity of a thermodynamic process using enthalpy change (ΔH), entropy change (ΔS), and temperature (T). Simply enter the known values, and the calculator will automatically compute the Gibbs free energy ΔG using the relation ΔG = ΔH − TΔS. This tool is ideal for students, researchers, and engineers analyzing reaction feasibility and thermodynamic processes.

What You Can Calculate

• ΔH (Enthalpy change): Heat absorbed or released by the system, measured in kJ/mol.
• ΔS (Entropy change): Measure of disorder or randomness in the system, measured in kJ/(mol·K).
• T (Temperature): Absolute temperature of the system in Kelvin (K) or Celsius (°C).
• ΔG (Gibbs free energy): Determines the spontaneity of a process, measured in kJ/mol.

Formulas Used in the Calculator

The calculator applies the fundamental Gibbs free energy equation:

• ΔG = ΔH − TΔS   (Gibbs free energy from enthalpy, entropy, and temperature)

Interpretation of ΔG:

• ΔG < 0 → Spontaneous process
• ΔG > 0 → Non-Spontaneous process
• ΔG = 0 → At Equilibrium

How to Use the Calculator

1. Enter the enthalpy change (ΔH), entropy change (ΔS), and temperature (T).
2. Select the appropriate units for each value (kJ/mol, kJ/(mol·K), K/°C).
3. The calculator will automatically compute ΔG and indicate whether the process is spontaneous, non-spontaneous, or at equilibrium.
4. Use the results to analyze chemical reaction feasibility or thermodynamic behavior of systems.

Applications of Gibbs Free Energy Calculations

• Determine the spontaneity of chemical reactions under specific temperature conditions.
• Assess thermodynamic feasibility of physical and chemical processes.
• Calculate ΔG for phase transitions, reactions, and electrochemical processes.
• Support research, teaching, and industrial applications in chemistry and chemical engineering.