Question 3. High concentrations of chlorine radicals (ClOx = CI+ CIO) in the antarctic spring stratosphere cause rapid destruction of Os. Recent observations indicate that the extent of Os depletion in antarctic spring is ultimately limited by conversion of CIOx to the long-lived HCl reservoir as Os concentrations fall to very low levels. Consider an air parcel in the antarctic spring stratosphere containing 0.8 ppmy CH, 0.6 ppmv 0%, 0.3 ppbv NOx, and 1.0 ppby ClOx, with an air density n. = 3.5x10 molecules cm". The following reactions cycle the ClOx and NOx radicals: CI+ 03 - CIO+ 0 CIO + NO CI + NO2 NO + O2 NO, + O2 (1) (2) (3) k= 7.9 x 101% cm molecule lg k = 2.7 x 104 cm moleculeg? ks=1.8 x 10 cm molecule si k=1 x 102 1 NO. + hy NO + OS (4) (a) Assuming steady state for ClOx and NOx radicals, show that [CI]