Problem: Break down reaction into its half-reactions.4Fe + 3O2 → 2Fe2O3

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We’re being asked to break down the given reaction below into its half-reactions.


Given Reaction:      4 Fe + 3 O2 → 2 Fe2O3


We’ll write the half-reactions using the following steps:

Step 1. Determine the charge of the species in the reactant side
Step 2. Determine the charge of the species in the product side
Step 3. Write the unbalanced half-reactions
Step 4. Balance the elements in each half-reaction
Step 5. Balance the charges: add electrons to the more positive side (or less negative side) 
Step 6. Determine the oxidation half-reaction and the reduction half reaction. 



Step 1. Determine the charge of the species in the reactant side

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Problem Details

Break down reaction into its half-reactions.

4Fe + 3O→ 2Fe2O3