For a lead-tin alloy of composition 40 wt% Sn-60 wt% Pb with a total mass of 2.8 kg at 180C (355F): (a) Determine the mass of the a and phases. (b) What is the primary phase present for this alloy? (c) Determine the mass of the primary phase and the eutectic microconstituents. (d) Determine the mass of eutectic a. Composition (at% Sn) 20 40 60 80 100 327C 600 300 Liquid 500 232C a+L 200 183C 400 18.3 61.9 97.8 300 100 a +P 1200 100 20 40 60 80 100 (Pb) Composition (wt% Sn) (Sn) Adapted from Binary Alloy Phase Diagrams, 2nd edition, Vol. 3, T. B. Massalski (Editor-in-Chief), 1990. Reprinted by permission of ASM International, Materials Park, OH. Temperature (C) Temperature ("F)