Use Arrhenius Rate Constant when you need to compute the Arrhenius rate constant as the frequency factor times exp of minus activation energy over R times temperature. Enter Frequency factor A, Activation energy, and Temperature using the definitions and units below so the result can be reproduced.

Frequency factor A

A finite measured or assumed value, expressed in 1/s.

Activation energy

A finite measured or assumed value, expressed in J/mol.

Temperature

A finite measured or assumed value, expressed in K.

The published tool contract uses this rule: Compute the Arrhenius rate constant as the frequency factor times exp of minus activation energy over R times temperature.

Rate constant k

The calculated rate constant k in 1/s.

The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability.

Retain the original Frequency factor A, Activation energy, and Temperature values and their units alongside the result. Pseudo First Order Rate is useful when you instead need to compute the observed pseudo first order rate constant for a second order reaction with one reactant in large excess. Rate Determining Step Checker provides another view by helping you compare two directly comparable elementary-step rate constants; the smaller constant identifies the slower step, while equal constants have no unique slower step.

• Pseudo First Order Rate

  Compute the observed pseudo first order rate constant for a second order reaction with one reactant in large excess.

• Rate Determining Step Checker

  Compare two directly comparable elementary-step rate constants; the smaller constant identifies the slower step, while equal constants have no unique slower step.

• Rate Law Calculator

  Compute the reaction rate from the rate constant and reactant concentrations raised to their reaction orders.