Chemical Reaction Engineering
In an ideal mixed reactor (at steady state), the

Composition throughout the reactor remains same
Exit stream has the same composition as the fluid within the reactor
Space time is equivalent to holding time for constant density systems
All of these

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Chemical Reaction Engineering
In Langmuir treatment of adsorption,

All the adsorption does not take place by the same mechanism
Extent of adsorption is more than one complete monomolecular layer on the surface
Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site

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