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
In the reversible reaction of the type, A + B ⇋ AB, in general

Neither of the reactions will be en-dothermic
The combination reaction will be endothermic, while the dissociation reaction will be exothermic
The combination reaction will be exothermic, while the dissociation reaction will be endothermic
Both forward and backward reactions will be exothermic

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