The volume of a gas and the number of particles is inversely proportional. Of those involved which is the major component of the mixture. The Air We Breathe 10 What is the chemical compound for air. . Major component of air examples. Carbon dioxide argon smog oxygen nitrogen. Chemistry questions and answers. Approximately 77 Nitrogen 20 oxygen 3 carbon dioxide carbon monoxideargon. Its free its everywhere and we cant live without breathing itbut how clean is the air were inhaling right now. Cotton fibers look like flat ribbons that got twisted. When we breathe in we inhale the same mixture of gases contained in the atmosphere as our nose cannot filter out the oxygen from other gases. Carbon dioxide a gas that plants depend on makes up less than 04 percent. It consists of mixture of gases like 78 nitrogen and 21 oxygen with traces of water vapor carbon dioxide argon and various other components. ...