Mole ConceptHard
Question
A 1.50 g sample of type metal (an alloy of Sn, Pb, Cu and Sb) is dissolved in nitric acid, and met stannic acid, H2SnO3, precipitates. This is dehydrated by heating to tin (IV) oxide, which is found to weigh 0.50 g. What percentage of tin was in the original type metal sample? (Sn = 119)
Options
A.33.33%
B.26.27%
C.29.38%
D.52.54%
Solution
Mass of tin = $\frac{119}{151} \times 0.5$ = 0.394 g
∴ Mass per cent of tin = $\frac{0.394}{1.5} \times 100$= 26.27%.
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