Use Arrhenius Pre-exponential Factor Calculator when you need to solve for A = k * exp(Ea/RT). Enter Rate constant k, Ea, and Temperature using the definitions and units below so the result can be reproduced.

Rate constant k

A finite measured or assumed value greater than or equal to 0.

Ea

A finite measured or assumed value greater than or equal to 0, expressed in J/mol.

Temperature

A finite measured or assumed value greater than or equal to 0, expressed in K.

The published tool contract uses this rule: Solve for A = k * exp(Ea/RT).

Pre-exponential factor A

The calculated pre-exponential factor a.

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

Retain the original Rate constant k, Ea, and Temperature values and their units alongside the result. Arrhenius Rate Constant is useful when you instead need to compute the Arrhenius rate constant as the frequency factor times exp of minus activation energy over R times temperature. Capacity Factor k' provides another view by helping you compute the capacity factor k-prime as adjusted retention time over dead time for a retained analyte.

• Arrhenius Rate Constant

  Compute the Arrhenius rate constant as the frequency factor times exp of minus activation energy over R times temperature.

• Capacity Factor k'

  Compute the capacity factor k-prime as adjusted retention time over dead time for a retained analyte.

• Acentric Factor Lookup

  Look up acentric factor omega of a common substance.