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. 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 264. kJ of energy. The temperature of the water bath is monitored, and it is determined from this data that 390. kJ of heat flows out of the system during the reaction.

Explanation / Answer

Reaction is exothermic          ( since heat is released)

Temperature of water bath goes up            ( since water absorbs heat released by reaction)

Piston moves out     ( since gas products formed and pressure is developed)

Gas system does work        ( work done by system when we have expansion)

work done W = 264 - 390 = - 126 KJ

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