Activation Energy Calculator

Your details

Choose what to solve for. The two-temperature methods need two measured rate constants or one plus the activation energy. The single-point mode uses the pre-exponential factor A.
Measured rate constant at temperature T1. Units must match k2 but can be anything consistent (they cancel when computing Ea).
s⁻¹
Measured rate constant at temperature T2. Must use the same units as k1.
s⁻¹
Temperature at which k1 was measured.
K
Temperature at which k2 was measured.
K
Activation energy EaModerate barrier
81.84kJ/mol

Energy barrier that must be overcome for the reaction to proceed

Activation energy Ea81,842J/mol
Activation energy Ea19.56kcal/mol
k2 / k1 ratio10.42
T1 in Kelvin600K
T2 in Kelvin700K
81.84 kJ/mol
Very low<40Low40-80Moderate80-150High150-250Very high250+

Ea = 81.8 kJ/mol, a moderate activation barrier.

  • The activation energy is 81.8 kJ/mol, a moderate (80-150 kJ/mol), common for uncatalyzed organic reactions at lab temperatures.
  • The rate constant increases by a factor of 10.42 from T1 to T2, reflecting the exponential temperature sensitivity of the Arrhenius equation.
  • A temperature change of 100.0 K increase produces that change in rate.
  • Higher activation energy means a steeper slope on an Arrhenius plot (ln k vs 1/T), so small temperature changes have a larger proportional effect on k.

Next stepCompare this value against the reference table below to see where this reaction fits within the typical chemical landscape.

 = Powered by OnlyCalculators