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 is the partial pressure of oxygen at s.t.p. in…A to eater to glass to air to water to glass to air.…The partial pressure of oxygen in a sample of air is…In the laboratory preparation of oxygen; dried…The weight of water vapour contained in a given…