$(15\%)$ Consider a binary mixture in an isolated system at 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 $G_{\text{m}\text{i}\text{x}}$ of this

mixture in liquid phase at the equilibrium state at $300K$ and $1\mathrm{.}72$ bar.