Chemical Reaction Engineering
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is

Either A or B, depends on other factors
Less
Same
More

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Chemical Reaction Engineering
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is

Surface reaction between A in the gas phase and absorbed B
Desorption of C
Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
Surface reaction between absorbed A and absorbed B

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Chemical Reaction Engineering
Space velocity

All of these
Is the maximum feed rate pre unit volume of reactor for a given conversion
Is a measure of the ease of the reaction
Describes the extensive operating characteristics of a tubular flow reactor

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