3. Given the lead magnesium (Pb - magnesium (Pb - Mg) phase diagram as follows. Composition (at% Pb) 0 10 20 30 40 70 100 700 L 1200 600 L + 1000 500 800 400 Temperature (EC) L Temperature L Me. Po 600 300 400 200 MR Pb 100 -Malpo 200 20 BO 100 40 60 Composition (wt% Pb) (Mg) PD (1) (20 pts) For an alloy that contains 50 wt% Pb, complete the table below: Temperature (C) Phase(s) presents Composition of each phase Mass fraction of each phase 600 C 500 C 300 C