288K. Calculate concentration in ppt. 2.6 x 107 trillion in 1 cm3. 3-20 CF2Cl2 and other fully halogenated CFCs do not contain H or multiple bonds, so they are not attacked by HO radicals. There is not, in the troposphere, light of sufficient energy to decompose them photochemically. CH2Cl2 does contain H which can be removed by HO and, hence, can be degraded in the troposphere.
First step needs light.
O each of which then degrades as in Figure 3-14. SO2 is a highly polluting, acidifying concentration. Acid rain has pH less than about 5.0. In this reaction, O3 is reduced to O2 in the alkaline solution, and I- is oxidised to I2. This amount is in 10.0 L of air.