What is the composition, in atomic percent, of an alloy containing 88 gms of tin

Question

What is the composition, in atomic percent, of an alloy containing 88 gms of tin (Sn) and 50 grams of lead (Pb). The atomic weight for tin is 118.69 and lead is 207.19.                 

                            
           36.2 atomic % Sn; 63.8 atomic % Pb                                 
           75.4 atomic % Sn; 24.6 atomic % Pb                                 
           63.8 atomic % Sn; 36.2 atomic % Pb                                 
           24.6 atomic % Sn, 75.4 atomic % Pb    

Explanation / Answer

88g / 118.69 = 0.7414 mol Sn

50g / 207.2 = 0.2413 mol Pb

0.7414 / (0.7414 + 0.2413) = .7544 or 75.44%

so lead = 24.36 %

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