2. [De Hoff 8.8] The excess free energy of mixing in face-centered cubic solid solutions of aluminum and zinc is well described by the relation: T Ag mix = Xq1Xzn(9600Xzn + 13200XA) (1 - 4000) Compute and plot curves for AG mix as a function of composition for a sequence of temperatures ranging from 300 to 700 K. (5 points) 2. [De Hoff 8.8] The excess free energy of mixing in face-centered cubic solid solutions of aluminum and zinc is well described by the relation: T Ag mix = Xq1Xzn(9600Xzn + 13200XA) (1 - 4000) Compute and plot curves for AG mix as a function of composition for a sequence of temperatures ranging from 300 to 700 K. (5 points)