Bromine-containing species play a role in environmental chemistry. For example, they are evolved in volcanic eruptions.
(a) The following molecules are important in bromine environmental chemistry: HBr, BrO, and HOBr. Which is an odd-electron molecule?
(b) Use bond dissociation enthalpies to estimate Δ_rH for three reactions of bromine:

(c) Using bond dissociation enthalpies, estimate the standard enthalpy of formation of HOBr(g) from H₂(g), O₂(g), and Br₂(g).
(d) Are the reactions in parts (b) and (c) exothermic or endothermic?

Transcribed Image Text:

Br₂(g) → 2 Br(g) 2 Br(g) + O₂(g) → 2 BrO(g) BrO(g) + H₂O(g) → HOBr(g) + OH(g)