Which chemical equation describes a combustion reaction? A) 2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(l) B) LiOH(aq) + HNO₃(aq) → LiNO₃(aq) + H₂O(l) C) N₂(g) + 3H₂(g) → 2NH₃(g) D) 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g) E) 2Al(s) + 3H₂SO₄(aq) → Al₂(SO₄)₃(aq) + 3H₂(g)

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Combustion reactions involve the reaction of a substance with oxygen gas, producing carbon dioxide and water among other products. Choice A represents this type of reaction, where a hydrocarbon (implied by the format, despite the subscript errors) reacts with oxygen gas to produce carbon dioxide and water.

Which Chemical Equation Describes a Combustion Reaction