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 From previous experiments, this chemical reaction is known to absorb 286. kJ of energy. The position of the piston is monitored, and it is determined from this data that the piston does 169. k of work on the system during the reaction. gases exothermic Is the reaction exothermic or endothermic? 0:10 up Does the temperature of the water bath go up or a down down? neither o in n out Does the piston move in or out? neither Does heat flow into or out of the gas mixture? o out nneither How much heat flows? Round your answer to 3 significant digits. Check Explanation

Explanation / Answer

The reaction is endothermic , as it is absorbing 286 KJ of energy.

Since the reaction is absorbing heat , so that means water will lose heat , so the temperature of water will go down.

Since the piston does 169 KJ of work at the system , which means that the work is done on the system , volume decreases and the piston moves in.

The heat is absorbed , which means that it is moved into the gas mixture.

The heat = 286 KJ + 169 KJ = 455 KJ

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