2. [5 marks] Gaseous nitrogen, N2(g), can be represented using a virial equation of state: Z = 1 + B'P + C'P2. The second virial coefficient for nitrogen gas is B' = -4.68 x 10 atm-1. Use this value, and the graph of Z vs P given on slide 4 in Topic 3, to estimate the value of the third virial coefficient for nitrogen gas. [Value of C' in atm-2, to three significant figures.] [Hint: you may assume that the N2 curve crosses the dashed horizontal line at exactly 200. atm.]