A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The

cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of $1$atm. The

cylinder is also submerged in a large insulated water bath. $($See sketch at right.$)$

From previous experiments, this chemical reaction is known to release $335.kJ$ of energy.

The position of the piston is monitored, and it is determined from this data that the system does $369.kJ$ of work on the

piston during the reaction.