Question

balance the following equation:
fe₂o₃ + al → al₂o₃ + fe
select the correct answer below:
○ fe₂o₃ + 2al → al₂o₃ + 2fe
○ fe₂o₃ + al → al₂o₃ + fe
○ 2fe₂o₃ + al → al₂o₃ + 2fe
○ fe₂o₃ + 2al → 2al₂o₃ + fe

Explanation:

Step1: Count atoms

Reactants: Fe - 2, O - 3, Al - 1. Products: Al - 2, O - 3, Fe - 1.

Step2: Balance Fe

Put 2 before Fe in products: Fe₂O₃ + Al → Al₂O₃ + 2Fe. Now Fe: 2 on both sides.

Step3: Balance Al

Put 2 before Al in reactants: Fe₂O₃ + 2Al → Al₂O₃ + 2Fe. Now Al: 2 on both sides.
All elements (Fe, O, Al) are balanced.

Answer:

Fe₂O₃ + 2Al → Al₂O₃ + 2Fe