Can someone help me?

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

From previous experiments, this chemical reaction is known to absorb 306kJ of energy.

The temperature of the water bath is monitored, and it is determined from this data that 351kJ of heat flows out of the system during the reaction.

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

Answer 1

1). The reaction absorbs heat (306 kJ). This makes the reaction endothermic.

2). Since 351 kJ of heat flows out of the system, the temperature of the water will go up.

3). As the gaseous reaction absorbs heat, the pressure will increase and push the piston out.

4). Since the piston moves out, the system is doing work on the surroundings.

5). The system absorbed 305 kJ of energy and released 351 kJ of energy. Work = difference between the two.

W = 46 kJ