1 and Problem 2 is for 40 points. Problem -1 For a 40 wt% Sn-60 wt% Pb alloy at 150C (300F), (a) what phase(s) is (are) present? (b)What is (are) the composition(s) of the phase(s)? Problem-2 For the lead-tin alloy in problem 1, calculate the relative amount of each phase present in terms of (a) mass fraction and (b) volume fraction. At 150C, take the densities of Pb and Sn to be 11.35 and 7.29 g/cm3, respectively. T( C) 300+ 200 a 100 L+a L (liquid) 183 C a + 855 Z+B B @ . K