The Haber process for producing ammonia commercially is represented by the equation N2 (g) + 3H2 (g) - > 2NH3 (g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?

In Haber process, N₂ reacts with H₂ and produces NH₃. The balanced equation for the Haber process is

N₂ (g) + 3H₂ (g) → 2NH₃ (g)

The stoichiometric ratio between H₂ and N₂ is 3 : 1

This means, reacted moles of N₂ = reacted moles of H₂ / 3

Hence moles of N₂ = 9.0 mol / 3

= 3.0 mol

Hence, 3.0 moles of N₂ is needed to react with 9.0 moles of H₂.