$(15\%)$Consider a binary mixture in an isolated system at equilibrium compositions at different pressures are shown bLow. At $300$K$,$ 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 AGmix of this mixture in liquid phase at the equilibrium state at $300$ K and $1\mathrm{.}72$ bar.