Point out the wrong statement in relation to enthalpy

Options

A. It is a state function
B. It is an intensive property
C. It is independent of the path followed for the change
D. Its value depends upon the amount of substance in the system

Explanation

To identify the wrong statement in relation to enthalpy, we need to analyze the properties of enthalpy and the statements provided. Here’s a step-by-step solution:

### Step 1: Understand the concept of Enthalpy
Enthalpy (H) is a thermodynamic quantity that represents the total heat content of a system. It is defined as:
\[ H = U + PV \]
where \( U \) is the internal energy, \( P \) is the pressure, and \( V \) is the volume of the system.

### Step 2: Identify the properties of Enthalpy
1. **State Function**: Enthalpy is a state function, meaning its value depends only on the state of the system (defined by properties such as temperature, pressure, and composition) and not on how the system reached that state. Therefore, the change in enthalpy (\( \Delta H \)) between two states is the same regardless of the path taken.

2. **Intensive vs. Extensive Property**: Enthalpy is an extensive property, meaning it depends on the amount of substance present in the system. For example, if you double the amount of a substance, the enthalpy change will also double.

3. **Path Independence**: The change in enthalpy is independent of the path taken to achieve that change. This means that whether the process is carried out in one step or multiple steps, the change in enthalpy will be the same.

4. **Dependence on Amount of Substance**: The value of enthalpy does depend on the amount of substance in the system. More substance means more enthalpy.

### Step 3: Analyze the statements
Now, we will analyze the statements given in the question:

1. **Enthalpy is a state function** - This is a true statement.
2. **Enthalpy is an intensive property** - This is a false statement. Enthalpy is an extensive property.
3. **Enthalpy change is independent of the path followed** - This is a true statement.
4. **Enthalpy value depends on the amount of substance in the system** - This is a true statement.

### Conclusion
The wrong statement in relation to enthalpy is: **"Enthalpy is an intensive property."** This statement is incorrect because enthalpy is an extensive property.

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