If You Were Atop Mt

Multiple Choice

If you were atop Mt.Everest,where 21 percent of the molecules in the air are O₂ and the partial pressure of oxygen is one-third that at sea level,approximately how many cubic meters of air would you need to breathe to gain the same number of oxygen molecules that you would gain from one cubic meter of air at sea level?

A) 1
B) 3
C) 5
D) 6
E) 9