Using the molar Gibbs free energy of mixing of liquid, and solid solutions (Gmix) vs XB, for binary system given to you. a) Identify the phase fields and equilibrium compositions of these phases on the figures. Explain briefly how you choose the stable phases (common tangents etc.) in general. b) Draw the phase diagram completely (indicate stable phase fields). Tm,A=800K and Tm,B= 1200K. The solutions are assumed regular. c) Draw schematically activity of component A and B vs. XB for 600K and 450 K keeping in mind the sign of activity coefficients for both solutions (s=0 J, l=-20000 J). d) Calculate and Draw activity of component B vs. XB at 600K and 450K