Among the following , the state funcation (s) is (are)

Options

A. Internal energy
B. Molar enthalpy
C. Reversible expansion work
D. Irreversible expansion work

Explanation

To determine which of the given options are state functions, we need to understand the concept of state functions in thermodynamics.

### Step-by-Step Solution:

1. **Definition of State Functions**:
A state function is a property of a system that depends only on the current state of the system, not on the path taken to reach that state. Examples include internal energy (U), enthalpy (H), pressure (P), volume (V), and temperature (T).

2. **Identify the Options**:
We need to analyze the given options (not provided in the question, but let's assume they include internal energy, molar enthalpy, heat, and work).

3. **Evaluate Each Option**:
- **Internal Energy (U)**: This is a state function because it depends only on the state of the system (temperature, pressure, volume) and not on how the system arrived at that state.
- **Molar Enthalpy (H)**: This is also a state function because it is defined in terms of internal energy and pressure-volume work, and it depends only on the state of the system.
- **Heat (q)**: This is not a state function; it is a path function because it depends on the specific process or path taken to transfer energy.
- **Work (W)**: Similar to heat, work is also a path function as it depends on the process followed to do the work.

4. **Conclusion**:
Based on the evaluation, the state functions among the options are:
- Internal Energy (U)
- Molar Enthalpy (H)

### Final Answer:
The state functions are Internal Energy (U) and Molar Enthalpy (H).

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