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For an alloy that consists of 90.2 g copper, 104.5 g zinc, and 2.7 g lead,...

For an alloy that consists of 90.2 g copper, 104.5 g zinc, and 2.7 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.
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