Question

The optimum conditions for the production of ammonia using Haber's process are:

• A. Temperature: $600K$
  Pressure: $10265kPa$
• B. Temperature: $723K$
  Pressure: $20265Pa$
• C. Temperature: $723K$
  Pressure: $20265kPa$
• D. Temperature: $700K$
  Pressure: $20265Pa$

Answer 1

The correct option is C Temperature: $723K$

Pressure: $20265kPa$
In Haber process $N_{2\left(g\right)}$ and $H_{2\left(g\right)}$ are reacted at a high temperature of $723K$ and $20265kPa$ pressure in presence of iron-bed catalysts $F{e}_3{O}_4$ mixed with ​$K_{2}O,Si{O}_2,$ and $A{l}_2{O}_3$ to produce $N{H}_3\left(g\right)$. It is an exothermic process which takes place in accordance with Le Chatelier’s principle.
$N_2\left(g\right)+3H_2\left(g\right)\stackrel{\Delta }{\rightleftharpoons }2N{H}_3\left(g\right)$
The activation barrier for the dissociation of $N_2$ and $H_2$ in​ the gas phase is very high.​ Without a catalyst, the ​
reaction between $N_2$ and $H_2$ occurs slowly.​
In the presence of a suitable​ catalyst such as Fe, the dissociation of $N_2$ and $H_2$ to give adsorbed atoms is facile.​