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

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

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Chemical Reaction Engineering
A batch reactor is suitable for

Large scale gaseous phase reactions
Liquid phase reactions
Achieving cent percent conversion of reactants into products
Obtaining uniform polymerisation products in highly exothermic reactions

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