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For which one of the following equations is ΔH⁰ equal to ΔH⁰f for the product?

1. 2CO(g) + O₂(g) → 2CO₂(g)
2. N₂(g) + O₃(g) → N₂O₃(g)
3. CH₄(g) + 2Cl₂(g) → CH₂Cl₂(l) + 2HCl(g)
4. Xe(g) + 2F₂(g) → XeF₄(g)

Correct answer: Xe(g) + 2F₂(g) → XeF₄(g)

Solution

The standard enthalpy of formation (ΔH⁰f) is defined for the formation of one mole of a compound from its elements in their standard states. Option D represents the formation of XeF₄ from its elements Xe and F₂ in their standard states.

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