What is the wt% Pb of -phase when the overall composition the system is 75wt% Sn at 175 degrees Celsius?

1,000 100 10 Solid (Ice) Liquid (Water) Pressure (atm) 1.0 0.1 Vapor (Steam) 0.01 0.001 -20 0 20 40 60 80 100 120 Temperature (C) 1,000 100 10 Solid (Ice) Liquid (Water) Pressure (atm) 1.0 0.1 Vapor (Steam) 0.01 0.001 -20 0 20 40 60 80 100 120 Temperature (C)