Which among the following given properties is not a state function

Options

A. internal energy
B. Enthalpy
C. Work
D. Entropy

Answer

To determine which property among the given options is not a state function, we first need to understand what a state function is.

### Step-by-Step Solution:

1. **Definition of State Function**:
A state function is a property of a system that depends only on its current state, not on the path taken to reach that state. Examples of state functions include internal energy (U), enthalpy (H), and entropy (S).

2. **Path Functions**:
In contrast, path functions depend on the specific path taken during a process. Work (W) and heat (Q) are examples of path functions because their values can change based on how the process occurs.

3. **Identifying the Options**:
We need to analyze the options provided (let's assume they are A, B, C, D) to identify which one is a path function. Typically, the options might include:
- A) Internal Energy (U)
- B) Enthalpy (H)
- C) Entropy (S)
- D) Work (W)

4. **Evaluating Each Option**:
- **Internal Energy (U)**: This is a state function.
- **Enthalpy (H)**: This is also a state function.
- **Entropy (S)**: This is a state function as well.
- **Work (W)**: This is a path function.

5. **Conclusion**:
Since work (W) is the only property listed that is not a state function, we conclude that the correct answer is the option that corresponds to work.

### Final Answer:
The property that is not a state function is **Work (W)**.

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