number 4 please

2. For the same Pb-Sn system, with Co-90 wt% Sn. provide the phases present. compositions, and the relative mass 500 F. 400 F. 300 F on for cach phase at the following temperatures Using Figure 2 (provided below), a 65 wt% Ni-35 wt% Cu alloy is heated to a temperature within the + liquid phase region. If the composition of the phase is 70 wt% Ni, determine (a) the temperature of the alloy (in degrees C) (b) the composition of the liquid phase (c) the mass fractions of both phases. 4. True or and compositions present after the thermal processing of materials. Explain your answer. False: Phase diagrams always provide an accurate prediction of the phases