(1) Based on your expression of the entropy of mixing 5(XB) ' derive the free energy mixing Emix of the molar A-B system (as discussed in class). Note the free energy of mixing is the difference of the free energy of the mixing phase compared to the NB separate phase. (2) Graphically show the free energy of Emix(XB) at T = 100 K and T = 300 K. Does the system favor the mixing phase or A/B separate phase? Why