A mixture or gaseous reactants is put into a cylinder, where a chemical reaction

Question

A mixture or 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.) From previous experiments, this chemical reaction is known to release 304. kJ of energy. The position of the piston is monitored, and it is determined from this data that the system does 281. 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? Be sure your answer has the correct number of significant digits.

Explanation / Answer

1. The reaction is exothermic.

2. The temperature of the water bath goes up.

3. The piston will move out.

4. The heat flows out of the gas mixture.

5. 304 KJ of heat is released by the gaseous mixture, out of which 291 KJ is used by the piston. Thus, heat flown into the water bath = 304-291 = 13.0 KJ

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