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We know that ΔH = ΔE + PΔV. In the reaction H2 + Br2 → 2HBr, there is no change in volume or ΔV = 0. So, ΔH = ΔE for this reaction.

1. ΔH = ΔE + PΔV
2. ΔH = ΔE for this reaction
3. ΔH = ΔE + VΔP
4. ΔH = ΔE + ΔP

Correct answer: ΔH = ΔE for this reaction

Solution

Since the reaction involves no change in volume (ΔV = 0), the term PΔV becomes zero, making ΔH equal to ΔE for this reaction.

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