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 1atm. 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 169.kJ of energy.

The temperature of the water bath is monitored, and it is determined from this data that 255.kJ of heat flows out of the system during the reaction.

Is the reaction exothermic or endothermic?	exothermic
	endothermic
Does the temperature of the water bath go up or down?	up
	down
	neither
Does the piston move in or out?	in
	out
	neither
Does the gas mixture do work, or is work done on it?	does work
	work is done on it
	neither
How much work is done on (or by) the gas mixture? Round your answer to 2 significant digits.	= kJ