A 2.1 g of sample of an oxide of iron on heating in a steam of hydrogen gas produce 0.720 gram of water. Determine the simplest formula of oxide iron.
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A 2.31gm sample of an oxide of iron heated in a stream of H2 produces 0.720 gm H20. What is the simplest formula of the oxide of iron?
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The molar mass of iron(II) oxide, FeO, is 71.844 g/mol; that of iron(III) oxide, Fe₂O₃, is 159.69 g/mol. Therefore 2.31 g of FeO is 0.0322 mol and 2.31 g of Fe₂O₃ is 0.0145 mol.The molar mass of water is 18.02 g/mol, so the H₂O produced is 0.0400 mol.
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