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A system goes from P to Q by two different paths in the P-V diagram as shown in Fig. 12.8. Heat given to the system in path 1 is 1000 J. The work done by the system along path 1 is more than path 2 by 100 J. What is the heat exchanged by the system in path 2?

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UP -UQ =W.D. in path 1 on the system + 1000 J

= W.D. in path 2 on the system + Q

Q = (–100 +1000)J = 900 J

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