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Rate Constant Calculator (Arrhenius)

Rate Constant (Arrhenius)

Compare k at Two Temperatures

Formula

k = A × e^(-Ea/RT) | ln(k₂/k₁) = (Ea/R)(1/T₁ - 1/T₂)

Frequently Asked Questions

What is the Arrhenius equation?
The Arrhenius equation k = A × e^(-Ea/RT) describes how the rate constant k depends on temperature. A is the pre-exponential factor, Ea is activation energy, R is the gas constant, and T is temperature in Kelvin.
What are typical units for rate constants?
Units depend on reaction order: zero order = M/s, first order = 1/s (s⁻¹), second order = 1/(M·s) or L/(mol·s). The pre-exponential factor A has the same units as k.

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