Question

the process of depletion or maintenance of ozone layer depends upon the rate ----- ozone molecules

Answer 1

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In the stratosphere CFCs are dissociated by UV light producing chlorine atoms. ... If the use of CFCs and other ozone-destroying chemicals are banned, it is hoped that ozone depletion may be reduced. The termozone depletion means that the destruction of O3 exceeds the creation of O3.

This reaction is written in chemical equations as

O2 + UV => O + O

2 O + 2 O2 + third molecule => 2 O3 + third molecule

Net Reaction: 3 O2 + UV => 2 O3

UV radiation is also involved in the destruction of O3.

This destruction is expressed as

O3 + UV => O + O2

O + O3 => 2 O2
Net Reaction: 2 O3 + UV => 3 O2

UV radiation plays a crucial role in the formation and destruction of ozone. UV amounts are greatest in the tropical regions, thus it is not suprising that most of the destruction and production of ozone occurs in the tropical stratosphere.

In 1970 Dr. P. Crutzen proposed the following catalytic reaction that results in the destruction of O3.

X + O3 => XO + O2

O3 + UV => 2 O2

O + XO => X + O2

Net Reaction: 2 O3 + UV => 3 O2
In this sequence of reactions, X is an atom or molecule that acts as a catalyst to convert O3 to O2. Note that X does not change in the net reaction and so it can continue to destroy O3 molecules. 

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