Chemistry — Haber Process Equilibrium
The ammonia equilibrium and the industrial compromise.
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\text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3
\Delta H < 0\ \text{(exothermic)}
\text{high P and low T favour NH}_3
\text{compromise: } 450^\circ\text{C},\ 200\ \text{atm}