Wow, you got that pretty close!
Now since the core columns were a LOT bigger in the basement than at the top (about factor 13), most of those 25 tons were up to the 88th floor. Around 24 tons, in fact. 1/3 of that would be 8 tons, but as I said, you'd need twice that much (nano-)thermite to melt steel, so we are bach at 24 tons of slack that we would have to account for.
Let's see who is stupid here....
The theoretical energy density of Fe2O3+Al thermite is 3.9 kJ/g.
The true energy density of normal (micron-)thermite is close to that value, 3.8-3.9 kJ/g
Now comes the bummer: Since nano-thermite is the
same chemicals as normal thermite, its theoretic maximum energy density is
still 3.9 kJ/g,
but, since the nano sized Al-particles develop 2-4nm of Al-oxide on their surface (this happens always within picoseconds, as soon as normal air is present), the energy density of nano-thermite
decreases as particle size decreases by as much as 35%. So nano-thermite has an energy-density of
only 2.5-3.3 kJ/g!
You would actually need
more nano-thermite than normal thermite!
If you mix your thermite with other substances, the energy density tends to decrease further, unless you mix in traditional organic materials, plus oxigene sources! In which case it isn't thermite anymore that does your work!
Why would it fall then? Why waste 16.000 tons of thermite (that's 16.000 delivery trucks, folks!!) if that won't even bring your tower down? What else would you need to bring it down?
News at elevety: Amazing discoveries will be announces shortly! E11eventy!!
And there I won my bet