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A Langmuir-Hinshelwood rate expression differs from a power law in having

  • A.no temperature dependence at all
  • B.only whole number exponents appearing in it
  • C.no rate constant of any kind
  • D.adsorption terms in the denominator

Answer: D

The denominator accounts for the competition of species for the surface, which is why the observed order can change with pressure. A power law is an empirical fit that hides this behaviour. Competition for sites is the cause.

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