Atmospheric Pressure at Sea Level Is 760 Mm Hg, and Oxygen

question 177

Multiple Choice

Atmospheric pressure at sea level is 760 mm Hg, and oxygen makes up 20.9% of this air when the air is dry.Scientists at a Mount Everest base camp measured the atmospheric pressure there as 400 mm Hg.When the air is dry, the partial pressure of oxygen at this base camp is approximately _______ mm Hg.

• A) 21
• B) 40
• C) 84
• D) 160
• E) 400

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