Atomic halogens greatly speed the rate of ozone destruction through several step

Question

Atomic halogens greatly speed the rate of ozone destruction through several steps in which they themselves are consumed and then regenerated. Rearrange the following chemical equations as needed and then combine them to show how Br atoms react with ozone to form oxygen but are not consumed in the overall process. Neither the Br atom nor the BrO radical should appear in the final chemical equation. Reaction (a): Br(g) + O_3(g) rightarrow BrO(g) + O_2(g) Reaction (b): Br(g) + 2O_2(g) rightarrow BrO(g) + O_3(g)

Explanation / Answer

a)

Br (g) + O3 (g) --------------------> BrO (g) + O2 (g) ----------------> (1)

b)

Br (g) + 2O2 -----------------> BrO (g) + O3 --------------------(2)

reverse equation 2)

BrO (g) + O3 ---------------------->Br (g) + 2O2   -------------------(3)

now add 1+ 2

Br (g) + O3 (g) --------------------> BrO (g) + O2 (g)

BrO (g) + O3 ---------------------->Br (g) + 2O2

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Br(g) + 2O3 (g) --------------------------> Br(g) + 3O2 (g) overall reaction

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