Which of the following is path funtion?
Correct answer: B. work and heat
- A. Internal energy
- B. work and heat
- C. Enthalpy
- D. Entropy
Explanation
Heat and work depend on the path followed during a process, so they are path functions, whereas internal energy, enthalpy and entropy are state functions. The common mistake is choosing internal energy because it changes during a process, but its change depends only on the initial and final states.
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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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