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
The feed rate is measured at temperature and pressure in the reactor
All of these
There is no change in number of moles in gaseous reaction

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Chemical Reaction Engineering
Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

Langmuir
None of these
The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process
There is no dynamic equilibrium between successive layer

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