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Questions with substantial discussion on the behavior of real gases using the van der Waals model (as opposed to just calculations with the van der Waals equation, or a casual reference to the van der Waals model).

Questions/answers with substantial discussion on the behavior of real gases using the van der Waals model (as opposed to just calculations with the van der Waals equation, or a casual reference to the van der Waals model).

(P + an^2/V^2)(V-nb) = nRT as opposed to PV=nRT for an ideal gas

In the van der Waals equation the constant "a" represents a pressure correction. The pressure correction is due to the fact that real gases have intermolecular forces whereas ideal gases should have none.

The constant "b" represents a volume correction. The volume correction is due to the fact that gas molecules have real, non-negligible volumes whereas the ideal gas equation assumes that the volume of the gas molecule is always negligible.