A 30wt% Sn–70 wt% Pb alloy is heated to a temperature within the a+liquid phase region. If the mass fraction of each phase is 0.5, estimate (a) the temperature of the alloy, and (b) the compositions of the two phases. The microstructure of an iron carbon alloy consists of proeutectoid ferrite and pearlite; the mass fractions of these microconstituents are 0.24 and 0.76, respectively. Determine the concentration of carbon in this alloy