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Question
For real gases the relation between p, V and T is given by van der Waals equation:
`p + (an^2)/V^2 (V - nb) = nRT`
where ‘a’ and ‘b’ are van der Waals constants, ‘nb’ is approximately equal to the total volume of the molecules of a gas. ‘a’ is the measure of magnitude of intermolecular attraction.
Arrange the following gases in the increasing order of ‘b’. Give reason.
\[\ce{O2, CO2, H2, He}\]
Solution
The increasing order of ‘b’ of the given gases is \[\ce{H2 < He < O2 < CO2}\]
Volume of a gas is proportional to the size of the molecule.
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For real gases the relation between p, V and T is given by van der Waals equation:
`p + (an^2)/V^2 (V - nb) = nRT`
where ‘a’ and ‘b’ are van der Waals constants, ‘nb’ is approximately equal to the total volume of the molecules of a gas. ‘a’ is the measure of magnitude of intermolecular attraction.
Arrange the following gases in the decreasing order of magnitude of ‘a’. Give reason.
\[\ce{CH4, O2, H2}\]
