What is expected when the reaction shown below takes place in a thermally-insula

Question

What is expected when the reaction shown below takes place in a thermally-insulated container outfitted with a movable piston at a constant atmospheric pressure of 1 atm? Volume will decrease and work will be done by the system on the surrounding. Volume will decrease and work will be zero. Volume will decrease and work will be done on the system by the surrounding. Volume will increase and work will be done on the system by the surrounding. Volume will increase and work will be done by the system on the surrounding.

Explanation / Answer

Forward reaction would be endothermic (as opposite reaction is a burning of ethane gas that is heat releasing step) and addition to this there is a net decrease in the number of moles from reactants to products (ie. -1). So after forward reaction container volume will decrease and hence option (c) .

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