In van der Waal's equation of state for a non ideal gas the term that accounts for i9ntermolecular forces is:

The van der Waal's equation is
$\left(p+\frac{a}{V^2}\right)\left(V-b\right)=RT$
The term $\left(p+\frac{a}{V^2}\right)$ is used for pressure correction, it measures the intermolecular force between the molecules of gas.