If 50% of the gas delivered to a patient is oxygen, its partial pressure at 1 atm is _____ mm Hg
a. 265.0 c. 380.0
b. 356.5 d. 403.5
ANS: C
The partial pressure of a gas in a mixture can be calculated by multiplying the total pressure of the mixture by the percentage of the mixture that the gas in question occupies. Therefore, 0.5 ? 760 mm Hg = 380 mm Hg.
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