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What is the oxidation number of Mg in elemental magnesium (Mg)?
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6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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In the reaction Fe2O3 + 3CO → 2Fe + 3CO2, which element is oxidized?
A
Oxygen (O)
B
None of the above
C
Iron (Fe)
D
Carbon (C)
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Identify the oxidation states of the elements in the reactants and products. For Fe in Fe2O3, oxygen in Fe2O3 and CO, and carbon in CO and CO2.
Determine the oxidation state of iron (Fe) in Fe2O3. Since oxygen is typically -2, calculate Fe's oxidation state accordingly.
Determine the oxidation state of carbon (C) in CO and CO2. Carbon in CO is usually +2, and in CO2 it is +4.
Compare the oxidation states of carbon in CO and CO2 to see if it increases or decreases. An increase in oxidation state means oxidation.
Conclude which element is oxidized based on the change in oxidation states: the element whose oxidation state increases is oxidized.
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