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

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 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 absorb 202. kJ of energy. The temperature of the water bath is monitored, and it is determined from this data that 388. kJ of heat Tows into the system during the reaction.

Explanation / Answer

This is an endothermic reaction

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The temperature of the water bath go down as heat flows into the system.

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388kJ energy moves into the system. In this total energy 202kJ is used from the reaction. Rest must have used in moving the piston out. So, answer is the piston moves out.

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The gas mixture does work.

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work done = 388-202 = 186 kJ

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