(Solved): In the Animated Figure 9.8 is shown the lead-tin phase diagram. For an alloy of composition 25wt%Sn ...

In the Animated Figure 9.8 is shown the lead-tin phase diagram. For an alloy of composition $25\mathrm{wt}\%\mathrm{Sn}?75\mathrm{wt}\%\mathrm{Pb}$, select the phase(s) present and their composition(s) for each of the temperatures cited. (a) $300^{?}\mathrm{C}$ ? $L=25.0wt\%\mathrm{Sn}?75.0\mathrm{wt}\%\mathrm{Pb};?=10.0\mathrm{wt}\%\mathrm{Sn}?90.0\mathrm{wt}\%\mathrm{Pb}$ $L=25.0wt\%\mathrm{Sn}?75.0\mathrm{wt}\%\mathrm{Pb}$ $L=90.0wt\%\mathrm{Sn}?10.0$ wt\% Pb ; $?=10.0$ wt\% Sn-90.0 wt\% Pb $L=10.0wt\%\mathrm{Sn}?90.0\mathrm{wt}\%\mathrm{Pb};?=10.0$ wt\% Sn-90.0 wt\% Pb (b) $200^{?}\mathrm{C}$ ? $L=25.0wt\%\mathrm{Sn}?75.0\mathrm{wt}\%\mathrm{Pb};?=25.0\mathrm{wt}\%\mathrm{Sn}?75.0\mathrm{wt}\%\mathrm{Pb}$ $?=17.0wt\%\mathrm{Sn}?83.0\mathrm{wt}\%\mathrm{Pb};L=55.7wt\%\mathrm{Sn}?44.3\mathrm{wt}\%\mathrm{Pb}$ $?=18.3$ wt $\%\mathrm{Sn}?81.7\mathrm{wt}\%\mathrm{Pb};?=97.8\mathrm{wt}\%\mathrm{Sn}?2.2\mathrm{wt}\%\mathrm{Pb}$ $?=17.0\mathrm{wt}\%\mathrm{Sn}?83.0\mathrm{wt}\%\mathrm{Pb};?=55.7\mathrm{wt}\%\mathrm{Sn}?44.3\mathrm{wt}\%\mathrm{Pb}$ (c) $183^{?}\mathrm{C}$ ? $?=25.0\mathrm{wt}\%\mathrm{Sn}?75.0\mathrm{wt}\%\mathrm{Pb};?=25.0\mathrm{wt}\%\mathrm{Sn}?75.0\mathrm{wt}\%\mathrm{Pb}$ $?=18.3\mathrm{wt}\%\mathrm{Sn}?81.7\mathrm{wt}\%\mathrm{Pb};?=97.8\mathrm{wt}\%\mathrm{Sn}?2.2\mathrm{wt}\%\mathrm{Pb}$ $L=61.9wt\%\mathrm{Sn}?38.1wt\%\mathrm{Pb};?=18.3wt\%\mathrm{Sn}?81.7wt\%\mathrm{Pb};?=97.8wt\%\mathrm{Sn}?2.2wt\%\mathrm{Pb}$ $L=25.0wt\%\mathrm{Sn}?75.0wt\%\mathrm{Pb};?=25.0$ wt\% Sn - 75.0 wt\% Pb; $?=25.0$ wt\% Sn-75.0 wt\% Pb (d) $100^{?}\mathrm{C}$ ? $L=25.0wt\%\mathrm{Sn}?75.0wt\%\mathrm{Pb};?=5.1wt\%\mathrm{Sn}?94.9\mathrm{wt}\%\mathrm{Pb};?=98.7wt\%\mathrm{Sn}?1.3\mathrm{wt}\%\mathrm{Pb}$ $?=25.0\mathrm{wt}\%\mathrm{Sn}?75.0\mathrm{wt}\%\mathrm{Pb};?=25.0\mathrm{wt}\%\mathrm{Sn}?75.0\mathrm{wt}\%\mathrm{Pb}$ $?=5.1\mathrm{wt}\%\mathrm{Sn}?94.9\mathrm{wt}\%\mathrm{Pb};?=98.7\mathrm{wt}\%\mathrm{Sn}?1.3\mathrm{wt}\%\mathrm{Pb}$ $L=25.0$ wt $\%\mathrm{Sn}?75.0$ wt $\%\mathrm{Pb};?=25.0$ wt $\%\mathrm{Sn}?75.0$ wt $\%\mathrm{Pb};?=25.0$ wt $\%\mathrm{Sn}?75.0$ wt\% Pb