mixture of gaseous reactants is put into a cylinder, where a chemical reaction t
ID: 1043868 • Letter: M
Question
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 cylinder is also submerged in a large insulated water bath. (See sketch at right.) constant pressure on the mixture of 1 atm. The 1 atm pressure piston From previous experiments, this chemical reaction is known to absorb 145. kJ of energy. The temperature of the water bath is monitored, and it is determined from this data that 310. kJ of heat flows out of the system during the reaction. gases Is the reaction exothermic or endothermic? o endothermic Does the temperature of the water bath go up or down? o down neither Does the piston move in or out? out O does work Does the gas mixture do work, or is workwork is done on it on t? How much work is done on (or by) the gas mixture? Round your answer to 3 significent digits. 455 kExplanation / Answer
As heat 310 kJ flows out of the system, the reaction is exothermic.
As heat flows out of the system to surroundings, the temperature of the water bath goes up.
As the work done on the system, the piston will move in.
Work is done on the system.
w = E - q
=> w = 145 - ( -310)
=> w = 455 J
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