Chemistry

Activation Energy Calculator

Find activation energy from rate constants at two temperatures.

Calculated Output

Activation energy (kJ/mol) 91.89

Formula: Ea = R · ln(k₂/k₁) ÷ (1/T₁ − 1/T₂)

Step-by-Step Breakdown

1. Values used:

2. Rate constant k₁ = 0.001

3. Temperature T₁ = 300 K

4. Rate constant k₂ = 0.01

5. Temperature T₂ = 320 K

7. Activation energy = 91.89kJ/mol

Did this calculator solve your problem today?

The math behind it

From the Arrhenius equation: Ea = R × ln(k₂/k₁) ÷ (1/T₁ − 1/T₂).

k doubles ×10 from 300→320 K → ~92 kJ/mol.

Higher Ea?

Means the rate is more temperature-sensitive.