In the classical Arrhenius equation , the pre-exponential collision factor is a critical kinetic parameter. What are its exact fundamental physical units?

Question

In the classical Arrhenius equation $k = A e^{-E_a/RT}$, the pre-exponential collision factor $A$ is a critical kinetic parameter. What are its exact fundamental physical units?

Prashant Kotian · Accepted Answer

Correct answer: C. In the equation , the exponential term represents a mere probability fraction and is strictly dimensionless. Therefore, to ensure dimensional consistency across the equals sign, the pre-exponential factor must inherently adopt the exact identical units as the specific rate constant , which vary depending directly on the overall order of the reaction.

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