$k = A e^{\left(-\frac{E_a}{RT}\right)}$

The equation shown above is known as the Arrhenius equation.

  • k = the rate constant, A = the frequency factor

  • Ea = activation energy (which is normally reported in units of J/mol or kJ/mol)

  • R = the ideal gas constant (8.314 J mol–1 K–1)

  • T = the absolute temperature (in K) at which the reaction is carried out

The Arrhenius equation is NOT included on the AP Chemistry Equations and Constants sheet, and you will NOT be asked to do any calculations with this equation on the AP Exam. However, it can be helpful to examine the Arrhenius equation in order to recognize the relationships between the rate constant (k), the activation energy (Ea), and the reaction rate.

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