Which of the following is NOT a state function?
Correct answer: C. Work
- A. Enthalpy
- B. Internal energy
- C. Work
- D. Temperature
Explanation
The amount of work done in going from one state to another depends on the route taken, for example whether a gas expands quickly or slowly, so work is a path function. Enthalpy, internal energy and temperature depend only on the current condition of the system. Heat is the other common path function, which is why heat and work are written as small quantities rather than as changes in a property.
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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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