Chemical Reaction Engineering
Rate of a chemical reaction is not affected by the

Temperature
Catalyst
Reactant's concentration
Number of molecules of reactants taking part in the reaction

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

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

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