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

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More
Same
Either A or B, depends on other factors

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Chemical Reaction Engineering
In an ideal P.F.R. at steady state conditions

There may be diffusion along the flow path
The conversion of the reactant varies from point to point along a flow path
The composition of reactants remains constant along a flow path
There is no lateral mixing of fluid

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