If the composition of air is 20 percent oxygen with an atmospheric pressure of 700 mm Hg, the partial pressure of oxygen would be
A. 14 mm Hg.
B. 20 mm Hg.
C. 140 mm Hg.
D. 700 mm Hg.
E. 1400 mm Hg.
Answer: C. 140 mm Hg.
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