If the system changes from a state Pl Vl to P2V2 by two paths then the quantity which remains unchanged is:
Correct answer: C. dQ-dW
- A. dQ
- B. dW
- C. dQ-dW
- D. dQ+dW
Explanation
In a thermodynamic process, the internal energy (ΔU = ΔQ - ΔW) is a state function, therefore it depends only on the initial and the final points of the system, thus remaining unchanged.
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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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