The partial pressure of oxygen when there is 25% oxygen in a gas mixture at an atmospheric pressure of 760 mm Hg is ____ mm Hg
a. 190 c. 1900
b. 30.4 d. 159.6
ANS: A
Partial pressure of oxygen = % oxygen ? barometric pressure, or 0.25 ? 760 mm Hg = 190 mm Hg.
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