Mole ConceptMedium
Question
When a mixture of aluminium powder and iron (III) oxide is ignited, it produces molten iron and aluminium oxide. In an experiment, 5.4 g of aluminium was mixed with 18.5 g of iron (III) oxide. At the end of the reaction, the mixture contained 11.2 g of iron, 10.2 g of aluminium oxide, and an undetermined amount of unreacted iron (III) oxide. No aluminium was left. What is the mass of the iron (III) oxide left?
Options
A.2.5 g
B.7.3 g
C.8.3 g
D.2.9 g
Solution
Mass of Iron (III) oxide left = (5.4 + 18.5) - (11.2 + 10.2) = 2.5 g
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