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 tums 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 atmm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) 1 atm pressure piston cylinder The temperature of the water bath is monitored, and it is determined from this data that 300.1J 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 system does 316.kJ of work on the piston during the reaction water bath gases exothermic Is the reaction exothermic or endothermic? O endothermic Does the temperature of the water bath go up or down? o down O neither in o out O neither Does the piston move in or out? absorb O release O neither Does the reaction absorb or release energy? How much energy does the reaction absorb or release? Round your answer to 3 significant

Explanation / Answer

Solution.

As heat flows out of the system, the reaction is exothermic.

As the system does work on the piston, the piston should move out.

The reaction is releasing energy as heat flows out of the system.

The reaction releases 300 kJ of energy as a heat and 316 kJ of energy as work. The total energy released is 300+316 = 616 kJ.

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