Which of the following is/are extensive properties?

Options

A. Entropy
B. Density
C. Enthalpy
D. Boiling point

Answer

To determine which of the following properties are extensive, we need to understand the definition of extensive properties. Extensive properties are those that depend on the amount of matter in a system. In contrast, intensive properties do not depend on the amount of matter.

Let's analyze the given options one by one:

1. **Entropy**:
- Entropy is a measure of the disorder or randomness in a system. It depends on the number of particles or moles of the substance present. Therefore, if the amount of substance increases, the entropy will also increase.
- **Conclusion**: Entropy is an extensive property.

2. **Density**:
- Density is defined as mass per unit volume. It is a ratio and does not change with the amount of substance. For example, the density of water remains 1 g/cm³ regardless of whether you have 1 liter or 2 liters of water.
- **Conclusion**: Density is an intensive property.

3. **Enthalpy**:
- Enthalpy is a measure of the total heat content of a system and also depends on the amount of substance present. If you have more moles of a substance, the enthalpy will increase.
- **Conclusion**: Enthalpy is an extensive property.

4. **Boiling Point**:
- The boiling point is the temperature at which a substance transitions from liquid to gas. It is a characteristic property of the substance and does not change with the amount of substance present. For instance, the boiling point of water remains 100°C regardless of whether you have 1 liter or 500 ml.
- **Conclusion**: Boiling point is an intensive property.

### Final Answer:
The extensive properties among the options are:
- **Entropy**
- **Enthalpy**