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It’s an honest question, so as to dispel all the chemtrail conspiracy theories.

Sinister chemtrail conspiracy theories do not need to be dispelled because anyone that believes those fluffy swirling lines are anything but vapor from jet fuel combustion will not listen to us attempting to set them straight.

Where does all the exhaust from 200 metric meters of fuel go? I don’t understand, and just asking an honest question.

Jet
1. a stream of a liquid, gas, or small solid particles forcefully shooting forth from a nozzle, orifice, etc.
2. something that issues in such a stream, as water or gas.
3. a spout or nozzle for emitting liquid or gas:

Air goes into the front intake scoop, mixes with the jet fuel, is ignited and shoots straight out of the back as hot exhaust through the nozzle.

In this photo the nozzle was blown off. I hope you know that not all of the fuel is used all at once. Your question, "(w)here does all the exhaust from 200 metric meters of fuel go" makes it seem as if you may not understand that the fuel is consumed gradually just the way your automobile consumes fuel for the whole length of the trip.

Where does all the exhaust from 200 metric meters of fuel go? I don’t understand, and just asking an honest question.

Into the air, out the back end of the jet engine.

More specifically - Assuming your jet fuel is pure dodecane (a form of kerosene), ideally every 2 molecules of that 200 metric meters of fuel combusts with 37 molecules of oxygen out of the air to form 24 molecules of carbon dioxide and 26 molecules of water (and a lot of heat). The stoichiometric equation for this combination follows:

2 C12H26(l) + 37 O2(g) → 24 CO2(g) + 26 H2O(g)

Of course, in a jet engine, this happens with more than one molecule at a time, otherwise you would not get a lot of thrust.

Freeper chemists are welcome to correct all my layman's mistakes in this explanation.