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

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

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Chemical Reaction Engineering
In an ideal mixed reactor (at steady state), the

Exit stream has the same composition as the fluid within the reactor
All of these
Composition throughout the reactor remains same
Space time is equivalent to holding time for constant density systems

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