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External mass transfer control is diagnosed by

  • A.an activation energy of a hundred kilojoules
  • B.a rate proportional to the particle volume
  • C.a rate that rises with fluid velocity
  • D.a rate entirely independent of velocity

Answer: C

If the film around the particle is the resistance, then thinning it by faster flow speeds the reaction. A rate that does not respond to velocity has ruled that particular resistance out. Film thickness is the variable.

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