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One litre of petrol (gasoline for American readers) weighs about 800 grams.

It is composed principally of carbon and hydrogen with a ratio of 2 carbon per 2 (and a bit) hydrogen or 24 units of mass carbon per 2 units of mass hydrogen.

This means that for every 800 gm (one litre) of fuel you have (24/26)x800 = 738 grams of carbon.

Since 1 carbon atom combines with 2 oxygen atoms each 12 gm carbon combines with 32 gm oxygen to make 44 gm Carbon dioxide.

So for every litre of fuel (which weighs 800gm) you have 738 gm carbon and require 1969 grams of oxygen to combust it.

This produces 738+1969= 2707 grams of CO2.

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