Which one is not state function ________________?
Correct answer: D. Work
- A. Internal energy
- B. Enthalpy
- C. Gibbs free energy
- D. Work
Explanation
Internal energy, enthalpy and Gibbs free energy depend only on the state of the system, so they are state functions. Work depends on the path used to transfer energy, so students may incorrectly choose internal energy because both work and internal energy appear together in the first law.
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About System, Surroundings and State Functions
A system is the part of the universe under study, while everything outside it is the surroundings; the boundary separates them. State functions such as pressure, temperature, volume, internal energy and enthalpy depend only on the state, unlike heat and work, which depend on the path taken.
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