Answer:
NH4NO2 (s) → N2(g) + 2H2O (I)
Step-by-step explanation:
On the left side we have 2 atoms of N, 4 of hydrogen and 2 of oxygen, on the left side we have 2 of N, we had 2 of hydrogen ans 1 of oxygen and we balanced it by adding the 2 in front of H20 this way we have 4 atoms of hydrogen ans 2 of oxygen.