Question
How is ammonia manufactured by Haber process?

Answer

On the large scale, ammonia is prepared by direct combination of dinitrogen and dihydrogen by Haber process.
In this process, dinitrogen reacts with dihydrogen under high pressure of $200 \times 10^5 Pa (200$ atm$)$ and temperature around $700 K$ to produce ammonia.
$N_{2(g)} + 2H_{2(g)} ⇌ 2NH_{3(g)}; \triangle _fH^\circ = -46.1 \ kJ \ mol^{-1}$
Iron oxide with trace amounts of $K_2O$ and $Al_2O_3$ is used as catalyst in Haber process.
High pressure favours the formation of ammonia as equilibrium is attained rapidly under these conditions.

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