In respiration we inhale 21% O2 & 0.04% CO2 and exhale 16.4% O2 & 4.4% CO2.

But if you calculate then 21-16.4 = 4.6 while 4.4-0.04 = 4.36.

That disturb the Mole concept in chemistry point of view.

In my opinion it leaves body in form of bicarbonate.

Correct me please.

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