Answer: 18 moles of nitrogen atoms
Step-by-step explanation:
TNT is trinitrotoluene with molecular formula of

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP, weighs equal to the molecular mass and contains avogadro's number
of particles.
From the molecular formula , it can be seen that :
1 mole of
contains 3 moles of nitrogen atoms.
Thus 6 moles of
contains =
moles of nitrogen atoms.
Thus 18 moles of nitrogen atoms are there in 6 moles of TNT.