Annual emissions of chlorine in CFCs were less than 1% by mass of the chlorine emitted...

Annual emissions of chlorine in CFCs were less than 1% by mass of the chlorine emitted in sea salt aerosol. Why don’t we need to worry about chlorine from sea salt being a major contributor to destroying stratospheric ozone? Type of Answer: Quantitative arguments. Ignore chemical processing of Cl- in aerosols. Ignore the fact that Cl- in sea salt is different from atomic Cl released by CFCs.

Expert Solution

When ultraviolet light waves (UV) strike CFC* (CFCl3) molecules in the upper atmosphere, a carbon-chlorine bond breaks, producing a chlorine (Cl) atom. The chlorine atom then reacts with an ozone (O3) molecule breaking it apart and so destroying the ozone. This forms an ordinary oxygen molecule(O2) and a chlorine monoxide (ClO) molecule. Then a free oxygen atom breaks up the chlorine monoxide. The chlorine is free to repeat the process of destroying more ozone molecules. A single CFC molecule can destroy 100,000 ozone molecules.

Chemical equation:

CFCl3 + UV Light ==> CFCl2 + Cl
Cl + O3 ==> ClO + O2
ClO + O ==> Cl + O2

The free chlorine atom is then free to attack another ozone molecule

Cl + O3 ==> ClO + O2
ClO + O ==> Cl + O2

and again ...

Cl + O3 ==> ClO + O2
ClO + O ==> Cl + O2

Chlorine in sea water does not destroy ozone layer since UV rays cannot break chlorine of sea water.There is no seawater chlorine in stratosphere and moreover in presece of UV rays substitution reaction occurs in carbon molecules.

queen_honey_blossom answered 2 years ago

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