<prompt> of O2 inhaled-5205078  <response>: Ans. is b i.e., 20 Atmospheric inspired airAlveolar airExpired air PP mm HgPP mm HgPP mm HgO220.8415813.410016116CO20.040.35.340432Nitrogen78.6259675.157374.1565H2O vapour0.505.76.2476.247 100760100760100760 