Concentraion methods

Question

Wood's metal contains 50.0% bismuth, 25.%lead, 12.5% tin and 12.50% cadmium by weight.

What is the mole fraction of tin ?

(Atomic weights : Bi =2O9, Pb =207 , Sn = 119, Cd = 112)

Easy

Solution

${\mathrm{X}}_{\mathrm{Sn}}=\frac{12.5/119}{\frac{50}{209}+\frac{25}{207}+\frac{12.5}{119}+\frac{125}{112}}=0.176$

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