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You are given the following data:
H2 (g) → 2H (g) ΔH° = -436.4 kJ/mol
Br2 (g) → 2Br (g) ΔH° = 192.5 kJ/mol
H2 (g) + Br2 (g) → 2HBr (g) ΔH° = -72.4 kJ/mol
Calculate ΔH° for the reaction
H (g) + Br (g) → HBr (g)
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Based on our data, we think this problem is relevant for Professor Sharpe Elles' class at KU.