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For an alloy that consists of 43.0 wt% Pb and 57 wt% Sn, what is the...

For an alloy that consists of 43.0 wt% Pb and 57 wt% Sn, what is the composition (a) of Pb (in at%), and (b) of Sn (in at%)? The atomic weights for Pb and Sn are 207.2 and 118.7 g/mol, respectively.

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