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What is What will be the PA O2 when FiO2 is 0.5? and explain in detail?
FiO2 = fraction of O2 in inspired = 50% Pressure at sea level = 760 mm Hg According to law to paial pressures of gases, Pressures exeed by a gas in a mixture is propoional : if 50% of air is O2 PAO2 = 50 % of 760 = 380 mm Hg.