After we are born, we inhale air into our lungs and that air diffuses into capillaries, where it comes into contact with the blood. within red blood cells, a protein called hemoglobin (hb) reacts with oxygen according to the chemical equation:

it means there are 3 atoms of oxygen

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

c. is the answer

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