In a normal breath. about 0.5 L of air at 1.0 atm and 293 k is inhaled. about 25.0% of the oxygen in air is absorbed by the lungs and passes into the bloodstresm. for a respiration rate of 18 breaths per minute, how many moles of oxygen per minute are absorbed by the body? assume the mole fraction of oxygen in air is 0.21. compare this result with example problem 1.1.