In the classical Arrhenius equation , the pre-exponential collision factor is a critical kinetic par — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

In the equation $k = A e^{-E_a/RT}$, the exponential term $e^{-E_a/RT}$ represents a mere probability fraction and is strictly dimensionless. Therefore, to ensure dimensional consistency across the equals sign, the pre-exponential factor $A$ must inherently adopt the exact identical units as the specific rate constant $k$, which vary depending directly on the overall order of the reaction.