Choose the correct answer. A thermodynamic state function is a quantity

Options

A. used to determine heat changes
B. whose value is independent of path
C. used to detemine pressure volume work
D. whose value depends on temperature only

Answer

To solve the question "A thermodynamic state function is a quantity", we need to analyze the characteristics of thermodynamic state functions and evaluate the provided options.

### Step-by-Step Solution:

1. **Understanding State Functions**:
- A thermodynamic state function is a property of a system that depends only on the current state of the system, not on how it reached that state. Examples include internal energy, enthalpy, entropy, and pressure.

2. **Evaluating the Options**:
- **Option 1**: "Used to determine heat change."
- This statement is incorrect because while state functions can be used in calculations involving heat, they do not directly determine heat change, which is path-dependent.

- **Option 2**: "Whose value is independent on path."
- This statement is correct. State functions are defined by their values at specific states and do not depend on the path taken to reach those states.

- **Option 3**: "Used to determine pressure volume work."
- This statement is incorrect. While state functions can be involved in calculations related to work, the work done depends on the path taken during the process, not solely on the state functions.

- **Option 4**: "Whose value depends only on temperature."
- This statement is incorrect. While some state functions may depend on temperature, others depend on pressure, volume, and other variables. Therefore, it is not accurate to say that their value depends only on temperature.

3. **Conclusion**:
- The correct answer is **Option 2**: "Whose value is independent on path."