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Line 6: The units of the pre-exponential factor A are identical to those of the rate constant and will vary depending on the order of the reaction. For a first-order reaction, it has units of s<sup>−1</sup>. For that reason, it is often called '''frequency factor'''. ~~The~~According to [[collision theory]], the frequency factor, A, depends on how often molecules collide when all concentrations are 1 mol/L and on whether the molecules are properly oriented when they collide. According to [[transition state theory]], A can be expressed in terms of the [[entropy of activation]] of the reaction. Values of A for some reactions can be found in [[Collision theory#Steric factor\|here]].▼ ▲Values of A for some reactions can be found inat [[Collision theory#Steric factor~~\|here~~]]. ==References==

Pre-exponential factor: Difference between revisions