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…2H2 + O2 → 2H2O: From this equation; calculate the…What is the percentage by mass of oxygen in…What is the partial pressure of oxygen at s.t.p. in…What volume of oxygen will be left unreacted when a…