For which reaction is ΔH equal to ΔU at constant temperature?
Correct answer A. H₂(g) + Cl₂(g) → 2HCl(g)
Explanation
ΔH = ΔU + ΔnRT, where Δn is the change in moles of gas. For H₂ + Cl₂ → 2HCl, Δn = 2 − 2 = 0, so ΔH = ΔU.
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