<prompt> What is the paial pressure for carbon-di-oxide in the expired air?0.3 mm Hg158 mm Hg40 mm Hg32 mm Hg  <response>: Paial pressure of CO2 in expired air PE CO2 - 32 mm Hg Carbon-di-oxide: Paial pressure of CO2 in inspired air Pi CO2 0.3 mm Hg Paial pressure of CO2 in alveolar blood PA CO2 40 mm Hg Paial pressure of CO2 in expired air PE CO2 32 mm Hg. 