What is this calculator used for?

This calculator helps you determine the activation energy (Ea) of a chemical reaction using the Arrhenius equation and two known rate constants at different temperatures. It’s useful in understanding how temperature affects reaction rates.

How to use this calculator?

• Enter the values of the two rate constants (k₁ and k₂).
• Enter the corresponding temperatures (T₁ and T₂) in Kelvin.
• The result will be calculated automatically.

Formula used:

Ea = (R × ln(k₂ / k₁)) / ((1/T₁) - (1/T₂))
where R = 8.314 J/mol·K

Example:

If k₁ = 2.5 × 10⁻³ s⁻¹ at T₁ = 298 K and k₂ = 1.2 × 10⁻² s⁻¹ at T₂ = 308 K, then:

Ea = (8.314 × ln(1.2e-2 / 2.5e-3)) / (1/298 - 1/308) ≈ 52.6 kJ/mol