# How do you represent the reduction of nitrogen to give ammonia?

$\frac{1}{2} {N}_{2} \left(g\right) + \frac{3}{2} {H}_{2} \left(g\right) \rightarrow N {H}_{3} \left(g\right)$
Industrially this reaction is catalyzed on metal surfaces, that can reduce the activation energies associated with cleavage of the $N \equiv N$ triple bond.