Significance of van der Waals constants.

1.	Significance of van der Waals constants.
Answer» • a : It is a measure of magnitude of intermolecular attractive forces within the gas. Greater the value of 'a', stronger are the intermolecular forces of attraction and gas can be liquefied more easily. • b : It is a measure of the effective size of the gas molecules. It is related to incompressible volume of the molecules. Units of 'a' and 'b’ \(a=\frac{P\times V^2}{n^2}\) = atm L² mol^-2 or bar dm⁶ mo^-2 ^{\(b=\frac{V}n\) =}Lmol^-1 or dm³ mol^-1

Answer»

• a : It is a measure of magnitude of intermolecular attractive forces within the gas.

Greater the value of 'a', stronger are the intermolecular forces of attraction and gas can be liquefied more easily.

• b : It is a measure of the effective size of the gas molecules.

It is related to incompressible volume of the molecules.

Units of 'a' and 'b’

\(a=\frac{P\times V^2}{n^2}\) = atm L² mol^-2 or bar dm⁶ mo^-2

^{\(b=\frac{V}n\) =}Lmol^-1 or dm³ mol^-1

Discussion