Step 1: The combustion of natural gas, $\mathrm{CH}_{4}(g)$, produces $\mathrm{CO}_{2}(g)$ and $\mathrm{H}_{2} \mathrm{O}(g)$ according to the balanced chemical equation:
$$\mathrm{CH}_{4}(g) + 2\mathrm{O}_{2}(g) \rightarrow \mathrm{CO}_{2}(g) + 2\mathrm{H}_{2}
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