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
Correct Answer:
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A)approximately 25 mmHg
B)approximately
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