12. Consider a binary mixture in an isolated system at equilibrium. The tempcrature is fixed at 300 K, the equilibrium compositions at different pressures are shown below.
 
At 300K, the saturated pressure of species 1 is 2 bar, and that of species 2 is 1 bar. Please calculate the molar Gibbs energy change on mixing, of this mixture in liquid phase at the equilibrium state at 300 K and 1.72 bar. [15 points]

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