Even in the days of van der Waals, the second virial coefficient for square well fluids ( 1 5) was known to be B b 4 9 5 exp(N A RT) 1 Noting that e x 1 x x 2 2 , this observation suggests the following equation of state Derive an expression for the Helmholtz energy departure function for this equa...

Even in the days of van der Waals, the second virial coefficient for square-well fluids ( =

Question:

Even in the days of van der Waals, the second virial coefficient for square-well fluids (λ = 1.5) was known to be B/b = 4 + 9.5 [exp(N_Aε/RT) -1]. Noting that e^x ~ 1 + x + x²/2 + …, this observation suggests the following equation of state: Z = 1 + 4bp 1-bp 9.5NE -bp RT