2. A little NOx will do A key point during our discussion of sustaining the trop
ID: 107071 • Letter: 2
Question
2. A little NOx will do A key point during our discussion of sustaining the tropospheric oxidizing capacity is that if there is "enough" NOx, HO2 reacts with NO instead of with ozone thereby regenerating OH and net producing O3. a. What is the threshold level of NOx such that Ho2 reacts with NO at least as often as HO2 reacts with ozone Assume ozone 11 molec cm and HO2 1x108 molec cm 3, and that NO and NO2 are in steady state. R4. o3 HO2 OH O2 k4 15 cm3 molec 1 si R5. NO HO2 OH NO ks 9.4x10 cm3 molec 1 s 1 R6. NO O NO2 O. k6 15 cm3 molec 1 s 1 R7. NO2 hv NO O3 k7 0.01 siExplanation / Answer
Answer- Ozone layer lies in the stratosphere layer of the atmosphere. it occurs at 30-60km from the earth surface. Ozone is formed by the reaction of Nitrogen dioxide (NO2), Carbon monooxide (CO), water vapor (H2O), and various volatile organic compound in the presence of light. the comounds also called Ozone precursors.
when ozone is occurs is below the thrushold value the less amount of ozone and hydroxyl ion will formed in the stratosphere.
Ozone destruction occurs in the upper layer of stratosphere. this region lies above 30-50km from earth surface. generally due to increase in amount of chlorofloro carbon, NO2, SO2 and CO and other green house gases within atmosphere. they cause depletion of ozone layer. and cause hole above the Antractica. ozone gas is destructed by the release of chlorinet, bromine and other halogens from the catalytic reaction in the polar stratophere.
the presence of sunlight, when UV rays strike to chlroflorocarbon CL-C bond breakdown and chlorine is librated. and this relase Chlorine cause ozone destruction
CFCl3 + UV Light ==> CFCl2 + Cl
Cl + O3 ==> ClO + O2
ClO + O ==> Cl + O2
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