Which is an extensive property?

Options

A. Temperature
B. Molar heat capacity
C. Gibb’s free energy
D. Molar volume

Explanation

To determine which is an extensive property, we need to understand the definitions of extensive and intensive properties in thermochemistry.

### Step-by-Step Solution

1. **Define Extensive Properties**:
- Extensive properties are those that depend on the amount or quantity of the substance present. This means that if you have more of the substance, the value of the extensive property will increase.

2. **Examples of Extensive Properties**:
- Common examples include mass, volume, and Gibbs free energy. These properties change when the size or amount of the sample changes.

3. **Define Intensive Properties**:
- Intensive properties, on the other hand, do not depend on the amount of substance. They remain constant regardless of how much substance is present. Examples include temperature, density, and molar heat capacity.

4. **Identify the Options**:
- In the context of the question, we need to look at the options provided (though not explicitly listed in the question) and identify which one is an extensive property.

5. **Select the Correct Answer**:
- Among the examples given, Gibbs free energy is identified as an extensive property. Therefore, the answer to the question "Which is an extensive property?" is Gibbs free energy.

### Conclusion
The extensive property from the options provided is **Gibbs free energy**.