Equal amounts of n2 and o2 are added, under certain conditions, to a closed container. which changes occur in the reverse reaction as the system proceeds toward equilibrium

1) The forward reaction is N2 (g) + O2 (g)  → 2NO

(that reaction requires special contitions because at normal pressures and temperatures N2 and O2 do not react to form another compound.

2) The equiblibrium equation is

  N2 (g) + O2 (g)  ⇄ 2NO

3) Then, the reverse reaction is

2NO → N2(g) + O2(g)

2NO → N2(g) + O2(g)