Explain the physical significance of Van der Waals parameters.

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Solution

Physical significance of ‘a’:

‘a’ is a measure of the magnitude of intermolecular attractive forces within a gas.

Physical significance of ‘b’:

‘b’ is a measure of the volume of a gas molecule.

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Q. What is the physical significance of Vander Waals parameter.

Van der Waals’ equation explains the behavior of:

The van der Waals' parameters for gases W,X,Y and Z are

$\begin{matrix} G a s & a (l i t r e^{2} - a t o m / m o l^{2}) & b (l i t r e / m o l) W & 4.0 & 0.027 X & 8.0 & 0.030 Y & 6.0 & 0.032 Z & 12.0 & 0.027 \end{matrix}$

Which one of these gases has the highest critical temperature?

The value of critical temperature $T_{C}$ for a gas is :

Q. If the van der Waals parameters of two gases are given as:

	$a / d m^{6} b a r m o l^{- 2}$	$b / d m^{3} b a r m o l^{- 1}$
Gas A	6.5	0.056
Gas B	18.0	0.011

Then which of the above statements is/are correct?

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Explain the physical significance of Van der Waals parameters.

Physical significance of ‘a’: ‘a’ is a measure of the magnitude of intermolecular attractive forces within a gas. Physical significance of ‘b’: ‘b’ is a measure of the volume of a gas molecule.

Physical significance of ‘a’:

‘a’ is a measure of the magnitude of intermolecular attractive forces within a gas.

Physical significance of ‘b’:

‘b’ is a measure of the volume of a gas molecule.