Question

Van der Waal's equation for a gas is stated as, $p=\frac{nRT}{V-nb}-a(\frac{n}{b}{)}^2$. This equation reduces to the perfect gas equation, $p=\frac{nRT}{V}$, when _____________.

• A. temperature is sufficiently high and pressure is low
• B. temperature is sufficiently low and pressure is high
• C. both temperature and pressure are very high
• D. both temperature and pressure are very low

Answer 1

The correct option is A temperature is sufficiently high and pressure is low

At high temperature and low pressure, the volume of atoms and the attractive forces between atoms is assumed to be negligible and Van der Waal's equation get converted to the ideal gas equation.

Option A is correct.