Chapter 19, Problem 94E

The Haber process is very important for agriculture because it converts N₂(g) from the atmosphere into bound nitrogen, which can be taken up and used by plants. The Haber process reaction is ${\text{N}}_{\text{2}}\left(g\right)+{\text{ 3 H}}_{\text{2}}\left(g\right)\rightleftharpoons {\text{2 NH}}_{\text{3}}\left(g\right)$ . The reaction is exothermic but is carried out at relatively high temperatures. Why?