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 222.kJ of energy.

The position of the piston is monitored, and it is determined from this data that the system does 225.kJ of work on the piston 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 heat flow into or out of the gas mixture?	in
	out
	neither
How much heat flows? Round your answer to 1 significant digit.	___kJ