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.) The temperature of the water bath is monitored, and it is determined from this data that 140. kJ of heat flows out of the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the piston does 194.kJ of work on the system during the reaction.

Explanation / Answer

Based on the given data,

1) the reaction is exothermic since energy is released from the reaction

2) Since the energy released in the above reaction so the temperature of water bath increases.

3) Since piston is done the work on the system hence piston moves in

4) Work is done by the piston hence it realeases energy and it is given as 140 kJ.

5) work done on the system dE = q + W

dE = 190 +140 = 330 kJ = 3.3*10^2 kJ for two significants

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