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

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

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Chemical Reaction Engineering
For all positive reaction orders for a particular duty,

Mixed reactor is always larger than the plug-flow reactor
Density variation during reaction affects design
Reactor size is independent of the type of flow
Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order

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