(Using Dalton's Law) if atmospheric pressure at sea level is 760 mmHg - oxygen forms approximately 20.9% of the gas mixture with a partial pressure of 160 mmHg. At an elevation of 12,000 feet atmospheric pressure is 500 mmHg. What proportion of the air is oxygen? Choose from the following: (A) less than 20.9 % (B) more than 20.9% (C) 20.9%

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