A reaction that contributes to the depletion of ozone in thestratosphere is the direct reaction of oxygen atoms withozone:O(g) + O3(g) ----->2 O2(g) At 298 K the rate constant for this reaction is 4.8 x105M-1 s-1. (a) Based on the units of the rate constant, writethe likely rate law for this reaction. (b) Would you expectthis reaction to occur via a single elementary process?Explain why or why not. (c) Use ΔHf° values estimate the enthalpy change for this reaction.Would this reaction raise or lower the temperature of thestratosphere?
A reaction that contributes to the depletion of ozone in the
stratosphere is the direct reaction of oxygen atoms with
ozone:
O(g) + O3(g) ----->2 O2(g)
At 298 K the rate constant for this reaction is 4.8 x105
M-1 s-1. (a) Based on the units of the rate constant, write
the likely rate law for this reaction. (b) Would you expect
this reaction to occur via a single elementary process?
Explain why or why not. (c) Use ΔHf° values estimate the enthalpy change for this reaction.Would this reaction raise or lower the temperature of the
stratosphere?
The direct reaction of oxygen atoms with ozone is -
O (g) + O3 (g) 2O2 (g)
Given : rate constant = 4.8 x 105 M-1 s-1
a) The unit of rate constant is M-1 s-1 which shows that order of reaction is second order.
Hence, the rate law for this reaction is :
rate = k [O][O3]
b) A reaction that contributes to depletion of ozone layer mechanism is -
Step 1 : O2 (g) 2O (g)
Step 2 : O2 (g) + O (g) O3 (g)
Step 3 : O3 (g) + O (g) 2O2 (g) (slow )
The reaction occurs in different elementary steps. Step 3 is the slowest step which is rate determining step.
Hence, the reaction would not occur via a single elementary process.
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