Which of the following is not an extensive property ?

Options

A. Molarity
B. Molar heat capacity
C. Mass
D. Volume

Answer

To determine which of the following is not an extensive property, we need to understand the difference between extensive and intensive properties.

**Step 1: Define Extensive and Intensive Properties**
- Extensive properties are those that depend on the amount of substance present. Examples include mass, volume, and total energy.
- Intensive properties do not depend on the amount of substance. Examples include temperature, pressure, density, and molarity.

**Step 2: Analyze the Given Options**
- **Molarity**: This is defined as the number of moles of solute per liter of solution. It does not depend on the quantity of the solution; hence, it is an intensive property.
- **Heat Capacity**: This is the amount of heat required to change the temperature of a substance by one degree Celsius. It depends on the amount of substance, so it is an extensive property.
- **Mass**: This is the measure of the amount of matter in an object. It clearly depends on the amount of substance, making it an extensive property.
- **Volume**: This is the amount of space that a substance occupies. Like mass, it also depends on the amount of substance, so it is an extensive property.

**Step 3: Identify the Correct Answer**
From the analysis:
- Molarity is not an extensive property (it is intensive).
- Heat capacity is an extensive property.
- Mass is an extensive property.
- Volume is an extensive property.

Thus, the answer to the question "Which of the following is not an extensive property?" is **Molarity**.

**Final Answer: Molarity**

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