Must temperature be in Kelvin?
Yes, thermodynamic calculations require absolute temperature (Kelvin).
Calculator
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Results
Activation Energy (Ea)
40.20 kJ/mol
In Joules
40201.75 J/mol
Reaction Kinetics Analysis
Energy barriers and temperature sensitivity
Energy Barrier
Activation Energy (Ea):40.20 kJ/mol
Rate Change:10.00x
Reaction Interpretation
Low activation energy. The reaction proceeds relatively fast even at lower temperatures.
Arrhenius Insight
According to the Arrhenius equation, a 10 C increase in temperature typically doubles the reaction rate for reactions with moderate activation energies (~50 kJ/mol). Your data shows a 10.0x increase over a 50K difference.
How to Use
Step-by-step instructions
- 1Enter rate constant k1 and temperature T1 (in Kelvin).
- 2Enter rate constant k2 and temperature T2 (in Kelvin).
- 3The calculator will compute the Activation Energy (Ea).
Arrhenius Equation
Relates the rate constants (k) at two different temperatures (T) to the activation energy (Ea).
ln(k2/k1) = (-Ea/R)(1/T2 - 1/T1)Variables:
kRate constantTTemperature (Kelvin)RGas constant (8.314 J/mol*K)Example
Reaction Rates
Inputs:
k1:1.0 at 300K
k2:10.0 at 350K
Steps:
- 1.ln(10/1) = 2.302
- 2.1/350 - 1/300 = -0.000476
- 3.Ea = -8.314 x 2.302 / -0.000476 = 40,200 J/mol
Result:
40.2 kJ/mol