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.) 1 atm pressure piston cylinder The temperature of the water bath is monitored, and it is determined from this data that 276. kJ of heat flows into the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 323. kJ of work on the piston during the reaction water bath gases exothermic endothermic up Is the reaction exothermic or endothermic? ×1 Does the temperature of the water bath go up or down? O neither O in Does the piston move in or out? out O neither O absorb Does the reaction absorb or release energy? release O neither How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits. kJ

Explanation / Answer

(a) Since heat flows into the system, it is endothermic

(b) Temperature goes up

(c) Piston moves up as the work is done by the system.

(d) Energy is released by the system as the overall.

(e) deltaE = q + w = 276 - 323. = - 47.0 kJ

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