Hemoglobin Facts and Stats:
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• Each red blood cell (RBC) contains about 280 million Hb molecules.
• The average adult contains about 5 billion RBCs/milliliter of blood.
• The average adult has about 5 liters of blood.
• Thus, the average adult has about 790 grams (or 1.74 pounds) of Hb.
• Assuming the blood re-circulation time at rest is about 1 minute, the net transport of oxygen by Hb is about 0.1 liter/minute (or 0.05 mole/minute).