The unit of van der Waals constant 'a' is

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The vander walls  equation is written as:

\((p+\frac{an^2}{V^2})(V-nb) = nRT\)

\(\frac{an^2}{V^2}\) is the correction term for pressure and has the units of atmosphere.

\(\frac{an^2}{V^2}=atm \) 

or \(a=\frac{atm(L)^2}{(mol)^2}\) 

a = atmL2mol-2

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