9.18. Calculate the amount of each phase present in 1kg of a 50wt%Pb50wt%Sn solder alloy at (a) 300C, (b) 200C, (c) 100C, and (d) 0C (see Figure 9.16 ). FIGURE 9.16 Pb-Sn phase diagram. (After Metals Handbook, 8th ed., Vol. 8: Metallography, Structures, and Phase Diagrams, American Society for Metals, Metals Park, Ohio, 1973, and Binary Alloy Phase Diagrams, Vol. 2, T. B. Massalski, Ed., American Society for Metals, Metals Park, OH, 1986.)