Pre-exponential Factor Calculator
Calculate the Arrhenius pre-exponential factor (A)
About Pre-exponential Factor
The pre-exponential factor (A), also called the frequency factor, represents the frequency of molecular collisions with correct orientation for reaction.
Typical values:
- Unimolecular reactions: 10¹² - 10¹⁴ s⁻¹
- Bimolecular reactions: 10¹⁰ - 10¹¹ M⁻¹s⁻¹
A includes both the collision frequency (Z) and steric factor (p): A = p × Z