First slide

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

A

0.202
B

0.158
C

0.176
D

0.221

Solution

$X_{Sn} = \frac{12 .5 / 119}{\frac{50}{209} + \frac{25}{207} + \frac{12 .5}{119} + \frac{125}{112}} = 0 .176$

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