Question

For an alloy that consists of 95.6 g copper, 101 g zinc, and 7.43 g 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 207.2 g/mol, respectively.

(a)	Enter your answer for part (a) in accordance to the question statement	at%
(b)	Enter your answer for part (b) in accordance to the question statement	at%
(c)	Enter your answer for part (c) in accordance to the question statement	at%

Answer 1

Mass of copper in alloy Mass of zinc in alloy Mass of lead in alloy 95.6 g 101 g 7.43 g Total mass of alloy Sum of mass of all components in alloy 95.6 + 101 + 7.43 204.03 g Atomic Mass of copper Atomic Mass of zinc Atomic Mass of lead 63.55 g/mol 65.39 g/mol 207.2 g/mol Moles of element Mass Atomic mass Moles of copper 956 moles = 1.50433 moles Moles of zinc 1979 moles = 1.54458 moles Moles of lead 145 moles = 0.03586 moles Total moles 1.50433 + 1.54458 + 0.03586 3.08477 moles Mole % of component = Moles of component. 100 Total moles And, Atomic % = Mole % Thus, Atomic % of copper = 1.50433 433*100 3.08477 = 48.766 at % Atomic % of zinc = 1.54458 *100 = 3.08477 50.071 at % 0.03586100 = Atomic % of lead = 1.163 at % 3.08477