Among the following, the state function(s) is(are)internal energyGibbs energyreversible expansion workmolar enthalpy

To identify which of the given options are state functions, let’s clarify what a state function is. A 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, and Gibbs energy.

Analysis of the Options:

1. Internal Energy: This is a state function. It is a measure of the total energy of a thermodynamic system and depends only on the state of the system.

2. Gibbs Energy: Also known as Gibbs free energy, this is a state function. It represents the maximum reversible work that can be performed by a thermodynamic system at constant temperature and pressure.

3. Reversible Expansion Work: This is not a state function. It depends on the specific process and path taken during the expansion, not just the starting and ending states.

4. Molar Enthalpy: This is a state function as well. Enthalpy is defined for a specific state and, like internal energy and Gibbs energy, it's a potential energy of the system.

Final Answer:

The state functions among the options are:

1. Internal Energy
2. Gibbs Energy
3. Molar Enthalpy

Reversible expansion work is not a state function.