How to Calculate Activation Energy (Ea)
Determine reaction energy barrier step-by-step:
Enter Temp T1 & k1
Input baseline absolute temperature T1 in Kelvin and rate constant k1.
Enter Temp T2 & k2
Input elevated temperature T2 in Kelvin and accelerated rate constant k2.
Apply Gas Constant R
Uses universal gas constant R = 8.3144626 J/(mol·K).
View Ea in kJ & kcal
Get activation energy Ea in kJ/mol and kcal/mol simultaneously.
Key Features & Chemical Kinetics
Two-Point Arrhenius Equation
Rigorously computes Ea from log rate ratio ln(k2/k1) across temperature deltas.
Dual Energy Units
Converts seamlessly between SI kJ/mol and traditional kcal/mol.
Thermal Acceleration Factor
Calculates exact fold acceleration speedup (k2/k1).
Chemical Kinetics Guide: Arrhenius Activation Energy
The Arrhenius Equation models the temperature dependence of chemical reaction rate constants:ln(k₂ / k₁) = -(Ea / R) × (1/T₂ - 1/T₁) ⇒ Ea = [R · ln(k₂ / k₁)] / (1/T₁ - 1/T₂)
Frequently Asked Questions
?How does a catalyst affect activation energy (Ea)?
A catalyst provides an alternative reaction pathway with a significantly lower activation energy (Ea), drastically increasing the rate constant k without being consumed.