Which one of the following statements about state function is correct?

Options

A. Internal energy enthalpy, heat and work are all thermodynamic state functions.
B. A state function depends both on the past history of a system and on it present condition.
C. The state function describing a system of equilibrium changes with time.
D. The difference in a state function for any process depends only on the initial and final states.

Explanation

To determine which statement about state functions is correct, let's first understand what a state function is in thermodynamics.

### Step 1: Define 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 temperature, pressure, volume, internal energy, enthalpy, and entropy.

### Step 2: Analyze the Statements
Now, let's analyze the statements provided in the question. We need to identify which one correctly describes a state function.

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