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

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

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Chemical Reaction Engineering
Mean residence time is equal to the space time, when

The temperature, pressure and the density of reaction mixture remains constant throughout the reactor
There is no change in number of moles in gaseous reaction
The feed rate is measured at temperature and pressure in the reactor
All of these

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