If 20 Percentof the Air Is Composed of O₂,what Is

question 207

Multiple Choice

If 20 percentof the air is composed of O₂,what is the partial pressure of oxygen at an altitude of 20,000 feet where atmospheric pressure is 350 mmHg?

• A) 20 mmHg
• B) 70 mmHg
• C) 152 mmHg
• D) 760 Hg

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