A unimolecular gas-phase decomposition reaction occurs within a batch reactor; why does increasing pressure, above a certain threshold, negligibly affect the reaction rate?

💡 Explanation

Increasing pressure enhances collision frequency but only to a point; because after this threshold, nearly all molecules capable of reacting are already undergoing collisions. Therefore, further increasing collision frequency yields negligible rate increases, rather than a proportional increase, due to rate saturation.

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