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#### You are standing on the top of Mount Everest (elevation 29 028 ft; 8708 m) where atmospheric pressure is 235 mmHg and the ambient temperature is 0 ?C

###### Statistics

You are standing on the top of Mount Everest (elevation 29 028 ft; 8708 m) where atmospheric pressure is 235 mmHg and the ambient temperature is 0 ?C. The air composition is 78.6% N2, 20.8% O2, 0.04% CO2, and 0.50% H2O. Treat the air as an ideal gas.

(a) If you remove your oxygen set, how many times per minute must you breathe so as to satisfy your O2 requirements of 284 ml/min at BTP? (Recall that BTP is 1 atmosphere and 37 ?C). Assume that you take in tidal volumes of 1000 ml (at ambient conditions) and that you can transfer only 30% of the O2 into your blood.

(b) Assuming that you could breathe that fast, what would the composition of the expired air be? Your CO2 production rate is 227 ml/min at BTP, and expired air is fully humidified. (Partial pressure of water vapour at 37 ?C and 100% relative humidity is 47 mmHg.)