Some Basic Concepts Of Chemistry Question 82

Question: Wood’s metal contains 50.0% bismuth, 25.0% lead, 12.5% tin and 12.5% cadmium by mass. What is the mole fraction of tin?

(Atomic mass: Bi=209, Pb=207, Sn= 199, Cd= 112)

Options:

A) 0.202

B) 0.158

C) 0.176

D) 0.221

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Answer:

Correct Answer: C

Solution:

[b] $ X _{sn}=\frac{12.5/119}{\frac{50}{209}+\frac{25}{207}+\frac{12.5}{119}+\frac{12.5}{112}}=0.176 $



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