Which of the following are the characteristics of a real gas

Options

A. The molecules attract each other
B. It shows deviations from the ideal gas law
C. It obeys the gas law at low temperature and high pressure
D. The mass of molecules is negligible

Answer

To determine the characteristics of a real gas, we need to analyze the properties that distinguish real gases from ideal gases. Here’s a step-by-step solution:

### Step 1: Identify Intermolecular Forces
Real gases have intermolecular forces of attraction between their molecules. This is a key characteristic that differentiates them from ideal gases, which are assumed to have no intermolecular forces.

**Hint:** Consider how molecules interact with each other in real gases compared to ideal gases.

### Step 2: Deviation from Ideal Gas Law
Real gases do not perfectly obey the ideal gas law (PV = nRT) under all conditions. They show deviations from this law, particularly at high pressures and low temperatures, where the assumptions of ideal gas behavior break down.

**Hint:** Think about the conditions under which gases behave differently from the ideal gas equation.

### Step 3: Behavior at Temperature and Pressure
Real gases do not obey gas laws at low temperatures and high pressures. Instead, they tend to behave more like ideal gases at high temperatures and low pressures.

**Hint:** Reflect on the impact of temperature and pressure on gas behavior and how it relates to the ideal gas law.

### Step 4: Mass of Molecules
The mass of the molecules in a real gas is not negligible. Unlike ideal gases, which assume point particles with no volume and mass, real gases have molecules with significant mass.

**Hint:** Consider the implications of molecular mass in the context of gas behavior.

### Conclusion
Based on the analysis:
1. Real gases exhibit intermolecular attraction.
2. They deviate from the ideal gas law.
3. They obey gas laws at high temperatures and low pressures.
4. The mass of the molecules is not negligible.

Thus, the characteristics of a real gas include:
- Molecules attract each other (correct)
- They do not obey the ideal gas law (correct)
- They do not obey gas laws at low temperature and high pressure (incorrect)
- The mass of the molecules is not negligible (incorrect)

### Final Answer
The characteristics of a real gas are:
1. Molecules attract each other.
2. They deviate from the ideal gas law.