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

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

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Chemical Reaction Engineering
A batch reactor is

Suitable for gas-phase reactions on commercial scale
Most suitable for very large production rate
Least expensive to operate for a given rate
Suitable for liquid phase reactions involving small production rate

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