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Compute the given question

Question- For an alloy that consists of 31.9 wt% Pb and 68.1 wt% Sn.

Part 1- What is the composition of Pb (in at%).

Part 2- What is the composition of Sn (in at%)?

I want help to calculate the composition of Pb in alloy and the atomic weights for Pb and Sn are 207.2 and 118.7 g/mol, respectively.

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