For the gold and silver alloy system, the enthalpy of mixing at 1344 K is given by:
Hmix = XAg * XAu * (-13465 + 5412.8 * XAu)
where XAg and XAu are the mole fractions of Ag and Au in the system. The unit of enthalpy of mixing is joule. Compute and plot Hmix and Gmix as a function of XAu at this temperature, and explain the meaning of your graph in terms of solution thermodynamics.