Mole ConceptHard
Question
The mineral haematite is Fe2O3. Haematite ore contains unwanted material called gangue in addition to Fe2O3. If 5 kg of ore contains 2.78 kg of Fe, then what percentage of ore is gangue? (Fe = 56)
Options
A.55.6%
B.44.4%
C.20.6%
D.79.4%
Solution
Mass of Fe2O3 in the ore =$\frac{160}{2 \times 56} \times 2.78$= 3.97 kg
∴ Percentage of gangue =$\frac{5 - 3.97}{5} \times 100$= 20.6%
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