upper atmosphere, where chlorine atoms can be generated by the reaction CCl2F2 --> CF2Cl + Cl (photolysis of Freon-12) Chlorine atoms can also act as a catalyst for the destruction of ozone. The activation energy for the reaction Cl + O3 --> ClO + O2 is 2.1 kJ/mol. Cl is regenerated by the fast reaction ClO + O ---> O2 + Cl If the frequency factors are the same and both catalysts are in equal concentration, how many times faster, at -39°C, does the Cl catalysed reaction proceed compared to the reaction catalysed as described in the previous question.
Hello i found the answer for part a to this question but i quickly need help with part b please.
One pathway for the destruction of ozone in the upper atmosphere is
| O3(g) + NO(g) NO2(g) + O2(g) Slow |
| NO2(g) + O(g) ---> NO(g) + O2(g) Fast |
| Overall reaction: O3(g) + O(g) --> 2O2(g) |
Ea is 14.0 kJ/mol, for the uncatalyzed reaction:
| O3(g) + O(g) ---> 2O2(g) |
1a) Ea for the same reaction, when catalyzed as above, is 11.9 kJ/mol.
At -37°C, what is the ratio of the rate constant for the catalyzed reaction to that for the uncatalyzed reaction?
(Assume the frequency factor A is the same for each reaction.) The ANSWER for this question is 2.91
1b)
One of the concerns about the use of freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the reaction
| CCl2F2 --> CF2Cl + Cl (photolysis of Freon-12) |
Chlorine atoms can also act as a catalyst for the destruction of ozone.
The activation energy for the reaction
| Cl + O3 --> ClO + O2 |
is 2.1 kJ/mol.
Cl is regenerated by the fast reaction
| ClO + O ---> O2 + Cl |
If the frequency factors are the same and both catalysts are in equal concentration, how many times faster, at -39°C, does the Cl catalysed reaction proceed compared to the reaction catalysed as described in the previous question.
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