When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only _______________ the true value?
Correct answer: B. Half
- A. Twice
- B. Half
- C. Equal
- D. None of these
Explanation
When diffusion controls the observed rate, the measured activation energy is reduced because the rate is governed partly by transport rather than solely by the chemical barrier; for common pore-diffusion models it is approximately half the intrinsic value. Thus the apparent activation energy is lower than the true reaction activation energy.
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