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 hath. (See sketch at right.) From previous experiments, this chemical reaction is known to absorb 346. kJ of energy. The temperature of the water bath is monitored, and it is determined from this data that 333. kJ of heat flows into the system 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 the gas mixture do work, or is work done on it? does work work is done on it neither How much work is done on (or by) the gas mixture? Be sure your answer has the correct number of significant digits.

Explanation / Answer

a)
Since chemical reaction absorbs heat, reaction is endothermic

b)
Heat is absorbed by reaction.So temperature will go down

c)
Since reactant changes into gases, piston will move out

d)
Since piston is moving out, gas mixture does work

e)
W = 346 - 333 = 13 KJ

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