A reaction that contributes to the depletion of ozone in the stratosphere is the direct reaction of oxygen atoms with ozone:

At 298 K the rate constant for this reaction is 4.8 × 105 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) From the magnitude of the rate constant, would you expect the activation energy of this reaction to be large or small? Explain.
(d) Use ˆ†Hof values from Appendix C to estimate the enthalpy change for this reaction. Would this reaction raise or lower the temperature of the stratosphere?

Transcribed Image Text:

0(g) + O3(g) 202(g)