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Assume each reaction is carried out in an open container. For which reaction will ΔH = ΔE?

1. C(s) + 2H₂(g) → 2H₂(g) + CO₂(g)
2. PCl₅(g) → PCl₃(g) + Cl₂(g)
3. 2CO(g) + O₂(g) → 2CO₂(g)
4. H₂(g) + Br₂(g) → 2HBr(g)

Correct answer: H₂(g) + Br₂(g) → 2HBr(g)

Solution

In an open container, ΔH = ΔE when there is no change in the number of moles of gases (Δn = 0). In option D, the number of moles of gaseous reactants equals the number of moles of gaseous products, so ΔH = ΔE.

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