For an alloy that consists of 938 g copper 1113 g zinc and 3

For an alloy that consists of 93.8 g copper, 111.3 g zinc, and 3.1 g lead, what are the concentrations of (a) Cu, (b) Zn, and (c) Pb in weight percent? The atomic weights of Cu, Zn, and Pb are 63.54, 65.39, and 207.2 g/mol, respectively.

Solution

weight percent can be calculated using the formula

Weight percentage = Weight of particular metal x 100 / weight of all metal

Let us calculate for all the metals

Weight percentage of Cu = 93.8 x 100 / (93.8 + 111.3 + 3.1) = 45.05 %

Weight percentage of Zn = 111.3 x 100 / (93.8 + 111.3 + 3.1) = 53.45 %

Weight percentage of Pb = 3.1 x 100 / (93.8 + 111.3 + 3.1) = 1.49 %