Final answer:
The question is about the bromination of methane and the reaction steps involved.
Step-by-step explanation:
The reaction represented by the equation ΔH° (per mole)hv, Br₂ → 2Br is the bromination of methane. This reaction occurs in multiple steps. Step a) ΔH° (per mole)hv, Br₂ → 2Br represents the bond dissociation of Br₂ into two Br atoms. Step b) hvBr₂ → 2Br involves the absorption of energy to break the Br-Br bond. Step c) Br₂ → 2Br + ΔH° represents the reaction where the Br atoms combine with methane to form methyl bromide and release energy. Lastly, step d) 2Br → Br₂ + ΔH° is the reverse reaction where the methyl bromide decomposes and absorbs energy to form Br₂.