What percentage of oxygen is contained in exhaled air? by Sunday | Apr 29 | Biology NECO | 0 comments A. 21% B. 16% C. 4% D. 0.04% E. Less than 0.01% Correct Answer: Option B – 16% Users Also Read These:What volume of oxygen will remain after reacting 8cm…What is the percentage by mass of oxygen in…If 0.75 mole of cyclopropane and 0.66 mole of oxygen…A source of sound produces waves in air of…The partial pressure of oxygen in a sample of air is…