round the answer to 3 significant digits Cylinder is a piston that moves in or o

Question

round the answer to 3 significant digits

Cylinder is 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 334. kJ of energy. The position of the piston is monitored and it is determined from this data that the system does 188. kJ of work on the piston during the reaction. Is the reaction exothermic or endothermic? Exothermic endothermic Does the temperature of the water bath go up or down? Up down neither Does the piston move in or out? In out neither Does heat flow into or out of the gas mixture? in out neither How much heat flows? Round your answer to 3 significant digits. ___ kJ

Explanation / Answer

Since the chemical reaction release energy (equals to 334KJ), it is an exothermic process. The cyclinder is placed in a water bath, thus, during the progress of the reaction when heat is released some part of the heat is transferred to the water, thereby increasing the water temperature. As given in the information the system (system here indicates teh gaseous mixture) does work on the piston, i.e. work is done by the system and hence piston moves up or out. As a general principle, since the reaction is an eothermic one, heat is released out of the gas mixture. During the process 334 kj of heat is released, out of which the system expense 188kj of energy in doing work on the piston. Thus, amount of heat energy released to water is equal to (334-188)KJ = 146 KJ

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