Which of the following can occur with a real gas but not with an ideal gas?

• A. Obeying the equation PV = nRT at all conditions
• B. Condensation into a liquid at high pressure and low temperature
• C. Having zero volume for individual gas particles
• D. Exhibiting no intermolecular attractions

Answer: (B)

Verified step by step guidance

1. Understand the assumptions of the ideal gas model: ideal gases are composed of point particles with no volume and no intermolecular forces, and they obey the equation \(PV = nRT\) under all conditions.
2. Recognize that real gases deviate from ideal behavior especially at high pressures and low temperatures because gas particles have finite volume and experience intermolecular forces.
3. Identify that condensation into a liquid occurs when gas particles attract each other strongly enough to come together, which is not possible in an ideal gas since it assumes no intermolecular attractions.
4. Note that having zero volume for individual gas particles and obeying \(PV = nRT\) at all conditions are characteristics of ideal gases, not real gases.
5. Conclude that condensation into a liquid at high pressure and low temperature is a phenomenon that can occur with real gases but not with ideal gases.