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.$)$

The temperature of the water bath is monitored, and it is determined from this data that $155.kJ$ of heat flows out of the

system during the reaction. The position of the piston is also monitored, and it is determined from this data that the

system does $254.kJ$ of work on the piston during the reaction.

How much energy does the reaction absorb or

release? Be sure your answer has the correct

number of significant digits.