A 35-year-old patient with pneumonia is receiving mechanical…

A 35-year-old patient with pneumonia is receiving mechanical ventilation with PEEP.  You are ordered to calculate the patient’s P(A-a)O2 level. The following conditions exist: PB = 750 torr  PH2O = 54 torr FIO2 = 50%PaCO2 = 36 torrPaO2 = 60 torr Based on the listed conditions, what is the patient’s P(A-a)O2?