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...

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Introduction To Chemical Engineering Thermodynamics
Even in the days of van der Waals, the second

Even in the days of van der Waals, the second virial coefficient for square-well fluids ( = 1.5) was known

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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

Derive an expression for the Helmholtz energy departure function for this equation of state.

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Z = 1+ 4bp 1-bp 9.5NE -bp RT

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