Estimate the system pressure and vapor-phase com position for a binary mixture (x 1 = 0.2) modeled

Question:

Estimate the system pressure and vapor-phase com position for a binary mixture (x₁ = 0.2) modeled by the 1-parameter Margules equation (A = 0.832) with the following properties: P₁^sat = 0.1 bar and P₂^sat = 1.1 bar. What would be the excess molar Gibbs free for this system?

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