2. At 150C for a 40wt%Sn/60wt%Pb alloy: a. What phases are present? b. What are the compositions of the phases present? c. What are the mass fractions of the phases? 3. For a 20wt%Sn/80wt%Pb alloy: a. At what T, can a state with 50% liquid be achieved? b. At 200C, how much Sn must be added to achieve the same state ( 50% liquid)? 4. Assuming a slow cooling for the melt, draw the expected microstructure of the following: a. 10wt% Sn at 100C b. 45wt%Sn at 200C c. 80wt%Sn at room temperature