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
Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b

Use CSTR with a high conversion, when a > b
Use batch reactor or plug flow reactor, when a > b
Use high pressure and eliminate inerts, when a > b
Avoid recycle, when a > b

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