The answer is - 3.44 moles of nitrogen atoms

The formula is N2O5, which means that there are two nitrogen atoms for every five

oxygen atoms. So if we have 8.6 moles of oxygen atoms, we have 2/5 as many

moles of nitrogen atoms, or 3.44 moles of nitrogen atoms.

For n moles of nitrogen and 8.6 moles of oxygen, we can set up the proportion:

8.6/5 = n/2. Solve for n and find n = 3.44 moles of nitrogen atoms