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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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