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Sun 30 Mar, 2014 12:56 pm
A closed gas system receives 250 kJ of heat at constant volume. It then rejects 75 kJ of heat while it has 25 kJ of work done on it at constant pressure. If a subsequent adiabatic process restores the system to its initial state, then what is the work done by the system during the process?
@chandra120768,
Do a heat balance
1st law of thermodynamics (you can't get something for nothing)
Q=250 Kj-75 Kj+25 Kj+0 Kj(adiabatic process)= 200 Kj
That the most/ideal
Now comes the 2nd law of thermodynamics (you can't break even) and this 200 Kj is an ideal maximum.
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