mixture? reactions?

Question

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.

The temperature of the water bath is monitored, and it is determined from this data that 

270.kJ of heat flows into the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the piston does 365.kJ of work on the system during the reaction.

1. Is the reaction endo- or exo- thermic?
2. Does the temp. of the water bath go up or down?
3. Does the piston move in or out?
4. Does the reaction absorb or release energy?
5. How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits.

Answer 1

The reaction would be endothermic since heat flowed INTO the system

The temperature of the water bath would down since heat left the water and entered the system

The piston would move in since it is doing work ON the system

The reaction would absorb energy since both heat and work are being done ON the system

∆E = q + w = 270. kJ + 365. kJ = 635 kJ of energy absorbed by the reaction (3 sig. figs.)