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
All of these
The feed rate is measured at temperature and pressure in the reactor

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Chemical Reaction Engineering
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

Slow reactions in catalyst of small pore diameter
Fast reactions in catalyst of small pore diameter
Fast reaction in catalyst of large pore diameter
Slow reactions in catalyst of large pore diameter

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