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You can simplify that by assuming that all the carbon in the fuel is converted to carbon dioxide.Most of the data you need is here.http://en.wikipedia.org/wiki/Boeing_747You also need to know the density of the fuel which is about 0.81 kg/litre.
Why is CO2 emitted high up more potent than a lower altitudes?
The higher in the atmosphere you come the less density there will be, that means fewer molecules to take up that radiation.
You’re with me so far?
Also, for interest's sake, here is part of an article in "New Scientist" in August 2008:-“A Virgin 747 flew from London to Amsterdam, consuming 22tonnes of fuel, 5% of which was biofuel…”This article covered a flight that was made to demonstrate that biofuel is a viable alternative to conventional aviation fuel. I cannot vouch for the authenticity of the article, and maybe the reporter meant that 22 tonnes of fuel were CARRIED, not consumed.The distance from London to Amsterdam is I think less than 400 Kilometres.
Well, you got the answer to why molecules is more heat trapping on higher altitudes. As for why there are fewer molecules higher up? Gravity seems the most reasonable answer here, just as you assumed.