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A resting person requires 14.5 L of oxygen per hour to maintain metabolic activities. Such a person breathes in 0.480 L of air at approximately 25.0 degrees celsius with each breath. The inhaled air is 20.9% while the exhaled air is 16.3%. How many oxygen molecules does a resting person inhale per breath?

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    The consumption per hour is not needed to answer this. The way it is worded, the O2 content of the exhaled breath is also not needed. Just compute the number of O2 molecules in 0.480 liters of air at NTP (25 C and 1 atm). I get about 0.00410 moles of O2. Convert that to molecules in the usual way.

    Only about 78% of that (163/209) gets absorbed into the bloodstream

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