Chlorofluorocarbons such as ccl 3 f and ccl 2 f 2 have been linked to ozone depletion in antarctica. as of 1994, these gases were found in quantities of 261 and 509 parts per trillion (10 12 ) by volume (world resources institute, world resources 1996–97). compute the molar concentration of these gases under conditions typical of (a) the mid-latitude troposphere (10°c and 1.0 atm) and (b) the antarctic stratosphere (200 k and 0.050 atm).