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

Question

A mixture of osseous 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 398. kJ of energy. The position of the piston is monitored, and it Is determined from this data that the piston does 114. kJ of work on the system during the reaction.

Explanation / Answer

Is the reaction exothermic or endothermic? The reaction is endothermic because this chemical reaction is known to absorb 398 kJ of energy.

Does the temperature of the water bath go up or down? The temperature of the water bath goes down because the reaction is endothermic.

Does the piston move in or out? The piston moves in, because thw work has a positive value, the change of volume is negative.

Does heat flow into or out of the gas mixture? The heat flows out of the gas mixture.

How much heat flows? q = -w; q= -114 kJ

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