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Balancing Fe + O2 = Fe2O3 (Iron + Oxygen gas)
Unbalanced equation:
Fe + O2 → Fe2O3

Steps to balance:

1. Write the unbalanced equation:
Fe + O2 → Fe2O3

2. Balance iron (Fe):
On the left side, there is 1 iron (Fe) atom.
On the right side, there are 2 iron (Fe) atoms in Fe2O3.
Place a coefficient of 2 in front of Fe on the left side to balance iron:
2Fe + O2 → Fe2O3

3. Balance oxygen (O):
On the left side, there are 2 oxygen (O) atoms in O2.
On the right side, there are 3 oxygen (O) atoms in Fe2O3.
To balance oxygen, place a coefficient of 3/2 in front of O2 on the left side:
2Fe + (3/2)O2 → Fe2O3

4. To eliminate the fraction, multiply the entire equation by 2:
4Fe + 3O2 → 2Fe2O3

Final balanced equation:
4Fe + 3O2 → 2Fe2O3