A Patient Receiving 60% Oxygen from an Air Entrainment Mask

A patient receiving 60% oxygen from an air entrainment mask has a partial pressure of oxygen (P_aO₂) of 45 mm Hg.The patient is being intubated and the ventilator set up.What is the appropriate fractional inspired oxygen (F_IO₂) to achieve a P_aO₂ of 60 mm Hg?

A) 0.65
B) 0.75
C) 0.8
D) 0.95