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Balance the following chemical equation correctly.
1. Hydrogen gas + Oxygen gas → water
2. Aluminum + Iron (III) oxide → Aluminum oxide + Iron
3. Sodium(s) + hydrochloric acid(aq) → sodium chloride(aq) + hydrogen(g)
4. Methane + Oxygen → Carbon Dioxide + Water
5. Water + Sulfur trioxide → Sulfuric acid