The virial form of van der Waal's gas equation is PV = RT (1 + B/V + C/V^2 + ... ) = RT (1 + B'P + C — States of Matter and Gaseous State Chemistry Question

Question

The virial form of van der Waal's gas equation is PV = RT (1 + B/V + C/V^2 + ... ) = RT (1 + B'P + C'P^2 + ... ). The second virial coefficient of argon gas at 262.5 K is -1 l mol^-1. What is the density of argon gas at 262.5 K and 1 atm? Neglect all the terms after second term in the virial forms, under these condition. (R = 0.08 L-atm/K-mol, Ar = 40)