O3 + O -->2O2)
Depletion of the ozone layer is believed to be caused by chlorinecatalyzed O3 decomposition. For the uncatalyzed reaction Ea,f= 19kJ/mol. For the following mechanism, Ea1, f =2.1 and Ea2,f =0.4kJ/mol:
Proposed Mechanism:
Cl+O3--> ClO +O2
ClO+O--> Cl+O2
a.) What is the dH for the reaction?
I know the answer is -390 kJ/mol. I don't know where this answercomes from!
b.) What is the Ea, r for the uncatalyzed reaction?
I know the answer is 409 . likewise I don't know where this numbercomes from . I see added and subtracted numbers but I need anexplaination.
c.) Which step in the above catalyzed reaction is faster ?
How would I know ?
d.) If dH* for the first reaction is -165 kJ/mol, sketch the energyprofile for the reaction.
dH* kJ/mol O3= 142.3 ,Cl=121.7 , O=247.5
Sketching energy profiles for the reaction how ?
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Based on a graph of Energy vs. Reaction pathway.
a.) How do I determine the intermediates formed in the reaction?
b.) How many transition states are there and how do I identify themfrom the graph?
(The graph has has three humps, )
c.) How many activation complexes are there ? How do I identifythem from a graph?
d.) How do I determine which step is the fastest and which step isthe slowest ? from a graph
e.)Is the reaction A-->B exotherminc or endothermic , how do Iknow based on the graph.
