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sci.arrhenius-rate-constant Calculator
Calculates the Arrhenius rate constant k = A·exp(−Ea/RT) and predicts reaction rate at any temperature given pre-exponential factor and activation energy. The pre-exponential factor A encodes collision frequency and steric factors — for bimolecular reactions in gas phase, A ≈ 10¹⁰–10¹¹ L/(mol·s).
Inputs
Activation Energy Kj Mol
Capacity to do work (J or kWh). Conserved — converts between forms but total stays constant in a closed system.
Pre Exponential A
A multiplier applied in the calculation.
Temperature K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Temperature2 K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
rate constant k at T1 (s⁻¹)
The value at the specified point or condition.
rate constant k at T2 (s⁻¹)
The value at the specified point or condition.
k ratio (T2/T1)
The proportional relationship between two quantities.
Q10 (rate doubling per 10°C)
The value at the specified point or condition.
k = Ae^(-Ea/RT)
Reference formula or conversion factor shown for context.
typical Ea range
The difference between the maximum and minimum values.