Determine the approximate density of a high-leaded brass that has a composition of 62.5wt%Cu,34.5wt%Zn, and 3.0wt%Pb. The densities of Cu,Zn, and Pb are 8.94,7.13 and 11.35g/cm3, respectively. g/cm3 For an alloy that consists of 86.5g copper, 110g zinc, and 6.26g lead, what are the concentrations (a) of Cu (in at\%), (b) of Zn (in at\%), and (c) of Pb (in at\%)? The atomic weights for Cu,Zn, and Pb are 63.55, 65.39, and 207.2g/mol, respectively. (a) at % (b) at % (c) at\%