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

1. A. H2(g) + Br2(g) -> 2HBr(g)
2. B. C(s) + 2H2O(g) -> 2H2(g) + CO2(g)
3. C. PCl5(g) -> PCl3(g) + Cl2(g)
4. D. 2CO(g) + O2(g) -> 2CO2(g)

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