Based on some recent information, in the UK it looks like its about 166 gpk (grams per kilometre)
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One kilometer is a unit of distance, while grams are a unit of mass. Therefore, the two units measure different things and cannot be directly converted into one another. To convert between the two units, you would need to know the density of the material in question.
2 PbO + C -> 2 Pb + CO2
Normal CO2 in the blood is the same as Normal PH. Ph is 7.35-7.45 CO2 is 35-45
Linear
There are two atoms of oxygen in the molecule. One of carbon and two of oxygen to get CO2.