When mixtures of chlorine and ozone (O_(3)) gas are irradiated with UV light of wavelength 330nm, ozone is destroyed through the following sequence of elementary reactions:
Cl_(2)+h
u ,->2Cl,k_(a)
Cl+O_(3)->ClO+O_(2),k_(1)
ClO+ClO->Cl+Cl+O_(2),k_(2)
ClO+ClO->Cl_(2)+O_(2),k_(3)
In this mechanism, the concentrations of ClO free radicals and Cl atoms are found to reach steady-state.
(c) At low temperatures, reaction (3) is replaced by the following reaction forming a stable dimer of ClO, which itself is rapidly photolysed to form Cl atoms:
ClO+ClO->Cl_(2)O_(2)->,->,2Cl+O_(2)
Describe briefly, in qualitative terms, the effect that this reaction will have on the observed rate of ozone destruction.
Note that k_(a)[Cl_(2)] is the rate at which photons are absorbed by Cl_(2), and is often referred to as I_(a).
(c)
At low temperatures,reaction(3)is replaced by the following reaction forming a stable dimer of CiO,which itself is rapidly photolysed to form C atoms:
CIO +CIO
Cl2O2
2CI+O
Describe briefly,in qualitative terms,the effect that this reaction will have on the observed rate of ozone destruction
Note that ka[Clz] is the rate at which photons are absorbed by Cl2,and is often referred to as la.