A mixture of gaseous reactants is put into a cylinder, where a chemical reaction
ID: 544967 • Letter: A
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
1atm
. 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
146.kJ
of energy.
The temperature of the water bath is monitored, and it is determined from this data that
371.kJ
of heat flows out of 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.
kJ
×10
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.
kJ
×10
Explanation / Answer
answers :
the reaction is exothermic
here chemical reaction release energy. so exothermic
the temperature of the water bath go up
the piston move out
Does the gas mixture does work
work done = 146 + 371
work done = 517. kJ
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