A system can be taken from the initial state P1V1 to the final state P2V2 by two different methods. Let Q and W represent the heat given to the system and the work done by the system.Which of the following must be the same in both the methods?
Correct answer: D. Q - W
- A. Q
- B. W
- C. Q + W
- D. Q - W
Explanation
Internal energy would be the same irrespective of the path.U (internal energy) = Q - W
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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