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A reaction has a true activation energy of 120 kilojoules per mole. What apparent value would you expect under strong pore diffusion control?

  • A.about 60 kilojoules per mole
  • B.about 120 kilojoules per mole
  • C.about 240 kilojoules per mole
  • D.about 12 kilojoules per mole

Answer: A

Strong pore diffusion control halves the apparent activation energy, because the observed rate depends on the square root of the intrinsic rate constant. This makes the diagnostic straightforward. Halving is the signature to look for.

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