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For an alloy that consists of 18g for copper, 36g for zinc, and 82g for lead, what are the concentrations of Zn in weight percent?

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For an alloy that consists of 18g for copper, 36g for zinc, and 82g for lead, what are the concentrations of Zn in weight percent? The atomic weights of Cu,Zn, and Pb are 63.54,65.39, and 207.2g/mol, respectively

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