Methane burns in oxygen to produce carbon dioxide and water. Which of the following represents a preliminary, unbalanced equation with the correct chemical formulas?
1. CH4 + O2 → CO2 + H2O
2. CH4 + CO2 → O2 + H2O
3. CO2 + H2O → CH4 + O2
4. CH4 → O2 + CO2 + H2O
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