Multiple Choice
Which of the following represents the correctly balanced chemical equation for the reaction between BaCl2 and MgSO4?
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3. Chemical Reactions
Balancing Chemical Equations
Multiple Choice
Which of the following is the correctly balanced form of the chemical equation: Fe + O2 → Fe2O3?
A
4 Fe + 3 O2 → 2 Fe2O3
B
3 Fe + 2 O2 → 2 Fe2O3
C
Fe + O2 → Fe2O3
D
2 Fe + O2 → Fe2O3
Verified step by step guidance1
Identify the elements involved in the reaction: iron (Fe) and oxygen (O). The product is iron(III) oxide, Fe2O3.
Write the unbalanced chemical equation: \(\mathrm{Fe} + \mathrm{O}_2 \rightarrow \mathrm{Fe}_2\mathrm{O}_3\).
Balance the iron atoms first. Since there are 2 iron atoms in Fe2O3, place a coefficient of 2 in front of Fe2O3, which gives 4 iron atoms on the product side. To balance iron on the reactant side, place a coefficient of 4 in front of Fe.
Balance the oxygen atoms next. On the product side, 2 molecules of Fe2O3 contain \(2 \times 3 = 6\) oxygen atoms. To get 6 oxygen atoms on the reactant side, place a coefficient of 3 in front of O2 (since each O2 molecule has 2 oxygen atoms, \(3 \times 2 = 6\)).
Verify that the number of atoms for each element is equal on both sides: 4 Fe atoms and 6 O atoms on both reactant and product sides, confirming the balanced equation is \(4 \mathrm{Fe} + 3 \mathrm{O}_2 \rightarrow 2 \mathrm{Fe}_2\mathrm{O}_3\).
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