Equilibrium Constant Calculator
Equilibrium constant calculator
Estimate equilibrium constant K from Gibbs free energy and temperature.
Result
K = 1.4873e+2
Uses ΔG° = -RT ln K.
Chem signal
Advanced options
Flow
- Enter standard Gibbs free energy in kJ/mol.
- Enter temperature in Kelvin.
- Read computed equilibrium constant K.
Example
Worked example: ΔG° = -12.4 kJ/mol at 298.15 K
- 1 Convert ΔG° to J/mol.
- 2 Compute exponent -ΔG°/(RT).
- 3 Apply exponential to get K.
K is approximately 148.5.
How
- Enter standard Gibbs free energy in kJ/mol.
- Enter temperature in Kelvin.
- Read computed equilibrium constant K.
Avoid
- Using kJ/mol directly in exponent without J/mol conversion.
- Entering Celsius temperature instead of Kelvin.
Checks
Best fit
Equilibrium Constant Calculator is built for estimate equilibrium constant k from standard gibbs free energy and temperature. If Equilibrium Constant Calculator does not match the input scope, compare the answer with a second method.
Input check
Match the entered values to this rule before copying the answer: ΔG° = -RT ln(K), so K = exp(-ΔG°/(RT)).
Sanity check
For Equilibrium Constant Calculator, use the worked example as a quick benchmark: K is approximately 148.5. If the equilibrium constant calculator answer is far away, check whether an input, unit, or mode changed.
Before copying
Review this common issue first: using kj/mol directly in exponent without j/mol conversion.
Ref only. Verify values. Follow lab safety.
FAQ
Can K be less than 1?
Yes. Positive ΔG° values produce K below 1.
Is this Kc or Kp?
It gives thermodynamic equilibrium constant form consistent with provided ΔG°.
Why does temperature matter?
The RT term scales the exponent and changes resulting K.
Switch
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