Actually, it is not. But reacting
2MgO > 2Mg + O2 would require a lot of energy to do.
Normally, in almost impossible reaction such as this, we call it irreversible, because of the price (energy, pressure) required is greater than what reasonable person would do.
Propane burning is an example, with the right conditions, and energy, one could make propane from carbon dioxide and water.
why is burning magnesium an irreversible reaction?
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