When air is inhaled, it enters the alveoli of the lungs, and varying amounts of the component gases exchange with dissolved gases in the blood. The resulting alveolar gas mixture is quite different from the atmospheric mixture. The following table presents selected data on the composition and partial pressure of four gases in the atmosphere and in the alveoli:
If the total pressure of each gas mixture is 1.00 atm, calculate:
(c) The number of O₂ molecules in 0.50 L of alveolar air (volume of an average breath of a person at rest) at 37°C