Chapter 6, Problem 6.18QE

(a)

Interpretation Introduction

Interpretation:

Whether the ratio $PV\text{/}nRT$ for a real gas has a value greater than or less than 1 has to be determined when the strong attractive forces exist between the particles.

Concept Introduction:

The combination of all the gas laws namely Boyle’s law, Charles law and Avogadro’s leads to the ideal gas law equation as given below:

  $PV=nRT$

For gases that obey this equation, the ratio of $PV\text{/}nRT$ is unity while for real gases the intermolecular attractive forces and size cause deviation in the value of ratio.

(b)

Interpretation Introduction

Interpretation:

Whether the ratio $PV\text{/}nRT$ for a real gas has a value greater than or less than 1 has to be determined when the volume of the gas-particle becomes significant relative to the total volume of the gas.

Concept Introduction:

One of the assumptions of a kinetic molecular theory is that the size of the gaseous molecules is quite small compared to the average intermolecular distance between any two molecules.