Arrhenius Chemical Kinetics Calculator
Compute a reaction rate constant from the pre-exponential factor, activation energy and absolute temperature using the Arrhenius equation.
How to Use the Arrhenius Chemical Kinetics Calculator
- Enter the pre-exponential factor A in the same units as the desired k.
- Enter the activation energy in kJ/mol.
- Enter the absolute temperature in kelvin.
- Click Calculate.
Anwendungsfälle
- •Shelf-life and stability modelling.
- •Reactor design and scale-up.
- •Teaching physical chemistry.
Formel
k = A · exp(−Ea / (R · T)), with R = 8.314 J/(mol·K). The activation energy is entered in kJ/mol.
Häufig gestellte Fragen
Who proposed this formula?
Svante Arrhenius introduced the exponential temperature dependence in 1889, for which he later won the 1903 Nobel Prize in Chemistry.
What are typical values of A?
For simple unimolecular gas reactions A is of order 10¹² to 10¹⁴ s⁻¹; for bimolecular liquid reactions 10⁸ to 10¹¹ M⁻¹·s⁻¹. Units depend on reaction order.
Why does a 10 K rise often double the rate?
For typical activation energies around 50 kJ/mol near room temperature, the exponential factor roughly doubles per 10 K. The calculator outputs the exact ratio for your inputs.