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Some Basic Concepts of Chemistry
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14/08/2021 10:33 am
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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)
(a) 0.202
(b) 0.158
(c) 0.176
(d) 0.221
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14/08/2021 10:37 am
Correct answer: (c) 0.176
Explanation:
Xsn = \(\frac{\frac{12.5}{119}}{\frac{50}{209} + \frac{25}{207} + \frac{12.5}{119} + \frac{12.5}{112}}\)
= 0.176