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Gibbs Free Energy Change — result sheet
Estimate Gibbs free-energy change from enthalpy change, temperature, and entropy change.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Delta G = Delta H - T Delta S, after converting entropy from J/(mol K) to kJ/(mol K).
Gibbs free-energy change combines enthalpy and entropy at a stated absolute temperature. A negative result is favorable under this simplified thermodynamic criterion, but it does not describe reaction speed.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Enthalpy change — kJ/mol; minimum -1000000000; maximum 1000000000
- Temperature — K; minimum 1.0E-6; maximum 1000000
- Entropy change — J/(mol K); minimum -1000000000; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Enthalpy change | -50 |
| Temperature | 298.15 |
| Entropy change | -100 |
Gibbs free-energy change -20.185 kJ/mol; favorable under the sign criterion.
Assumptions and limits
- Enthalpy is entered in kJ/mol, entropy in J/(mol K), and temperature is absolute kelvin.
- The supplied thermodynamic changes are treated as constant for this estimate; pressure, activities, and kinetics are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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