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After solving the Van der Waals equation for the compressibility factor and deriving the critical temperature, pressure, and volume knowing that a horizontal inflection point occurs on the isotherm at critical point am I supposed to solve PV3-(Pb+RT)V2+aV-ab=0 for the cubic root?

Homework Statement derivation of compressibility factor vs. reduced pressure I am supposed to derive the graph by solving equations Homework Equations Van der Waals equation of state compressibility factor, Z = (Pv)/(RT) reduced pressure = P/critical pressure Z = f(Tr, Pr) The...