Question

explain the physical significance of van der waals parameter? ​

Answer 1

Significance of van der Waals’ parameter ‘a’:

It is the measure of the magnitude of attractive forces between the molecules of a gas.

Unit: atm L2 mol−2 or bar L2 mol−2

Larger the value of ‘a’, larger will be the intermolecular force of attraction.

It is independent of pressure and temperature.

Significance of van der Waals’ parameter ‘b’:

It is the measure of the effective size of gas molecules.

Unit: L mol−1

Hope, this answers your question.

Answer 2

ANSWER

Please check the attachment for the Van Der Walls Equation.

1)The significance of Vander wall Perimeter 'a' =>

-The significance of constant ‘a’ gives the idea of the magnitude of attractive forces between the gas molecules and

-Its units are atm$(L^{2})(mol^{-2})$.

-Larger will be the value of ‘a’, larger will be the intermolecular force of attraction. It does not depend on pressure and temperature.

2)The significance of van der Waals’ parameter ‘b’=>

-It can be said as the measure of the effective size or volume of the gas molecules.

-Its Unit is $Lmol^{-1}$

EXTRA INFORMATION

Van der Waals forces

-It is the general term which is used to describe the attraction of intermolecular forces between molecules.

-It is mainly divided into two types =>

i)Weak London Dispersion Forces and

ii)Strong dipole-dipole forces

A special type of Van der Waal force is also there called Hydrogen Bond which is a special type of dipole-dipole interaction in between the hydrogen atom in a polar bond.