Question

The number of extensive properties in the following list is: Enthalpy, density, volume, internal energy, temperature.

• A. \( 4 \)
• B. \( 2 \)
• C. \( 3 \)
• D. \( 5 \)

Hint:

Extensive properties depend on the amount of substance, whereas intensive properties do not.

Answer 1

The Correct Option is C

Step 1: Categorize the Properties - Extensive: Enthalpy, Volume, Internal Energy
- Intensive: Density, Temperature Step 2: Count Extensive Properties \[ \text{Total extensive properties} = 3 \]

Answer 2

We are given the following list of physical properties:
Enthalpy, density, volume, internal energy, temperature.

The question asks: How many of these are extensive properties?

Definitions:
- Extensive properties depend on the amount of substance or size of the system. Examples include volume, mass, enthalpy, and internal energy.
- Intensive properties do not depend on the amount of substance or size. Examples include temperature, density, pressure.

Now, analyze each property:

1. Enthalpy (H):
- Enthalpy is the total heat content of a system.
- It depends on the size or amount of the system.
- Hence, enthalpy is an extensive property.

2. Density (ρ):
- Density is mass per unit volume.
- It is independent of the amount of substance.
- Hence, density is an intensive property.

3. Volume (V):
- Volume is the space occupied by the system.
- It depends on the amount of substance.
- Hence, volume is an extensive property.

4. Internal Energy (U):
- Internal energy is the total energy contained within the system.
- It depends on the system size.
- Hence, internal energy is an extensive property.

5. Temperature (T):
- Temperature is a measure of thermal energy per particle.
- It does not depend on the amount of substance.
- Hence, temperature is an intensive property.

Summary:
- Extensive properties: Enthalpy, Volume, Internal Energy → 3 properties
- Intensive properties: Density, Temperature → 2 properties

Therefore, the number of extensive properties in the given list is:
3