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The Langmuir adsorption isotherm assumes

  • A.a monolayer on equivalent sites
  • B.multilayer adsorption on a heterogeneous surface
  • C.that the adsorption is quite irreversible
  • D.that the surface area available is unlimited

Answer: A

The assumptions are strong but they give a tractable model that describes many systems well enough. The BET isotherm relaxes the monolayer assumption and is used for surface area measurement. Simplicity is what makes it useful.

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