Chemical Reaction Engineering
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Reaction is elementary but the molecularity may not be 2
Reaction is elementary with a molecularity of 2
Molecularity of the reaction is 2, but the reaction may not be elementary
Reaction may be elementary with molecularity of 2

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Chemical Reaction Engineering
In an ideal P.F.R. at steady state conditions

The composition of reactants remains constant along a flow path
There is no lateral mixing of fluid
The conversion of the reactant varies from point to point along a flow path
There may be diffusion along the flow path

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