In the reaction 4 Fe + 3 O_2 → 2 Fe_2O_3, how many atoms of iron (Fe) are required to react with 3 molecules of oxygen (O_2) to form 2 molecules of iron(III) oxide (Fe_2O_3)?

• A. 2 atoms of Fe
• B. 3 atoms of Fe
• C. 6 atoms of Fe
• D. 4 atoms of Fe

Answer: (D)

Verified step by step guidance

1. Identify the balanced chemical equation: \$4 \text{Fe} + 3 \text{O}_2 \rightarrow 2 \text{Fe}_2\text{O}_3$.
2. Understand that the coefficients in the balanced equation represent the number of molecules or atoms involved in the reaction. Here, 4 atoms of Fe react with 3 molecules of \(\text{O}_2\).
3. Since the question asks for the number of Fe atoms required to react with 3 molecules of \(\text{O}_2\), directly use the coefficient of Fe from the balanced equation, which is 4.
4. Recognize that the balanced equation shows the mole ratio, so 4 atoms of Fe correspond to 3 molecules of \(\text{O}_2\) reacting completely.
5. Conclude that 4 atoms of Fe are required to react with 3 molecules of \(\text{O}_2\) to form 2 molecules of \(\text{Fe}_2\text{O}_3\).