The given reaction steps show the decomposition of sodium acetate (H3C-COONa) into methane (CH4), hydrogen gas (H2), and water (H2O).

Sodium acetate decomposes into methane and sodium carbonate at higher temperatures. The methane formed in the reaction is a simple hydrocarbon gas.

CH3COONa → CH4 + Na2CO3

Further heating of sodium carbonate leads to the release of carbon dioxide and formation of sodium oxide.

Na2CO3 → Na2O + CO2

The sodium oxide then reacts with hydrogen gas to form sodium hydroxide and release more hydrogen gas.

Na2O + H2 → 2NaOH + H2

Finally, sodium hydroxide reacts with water to form sodium hydroxide solution and release hydrogen gas.

2NaOH + H2O → 2NaOH(aq) + H2 ↑

Overall, the decomposition of sodium acetate results in the formation of methane, hydrogen gas, and water.