Elements of Group 13, 14 and 15 — Chemistry STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceChemistryElements of Group 13, 14 and 154 Marks
Question
How is ammonia manufactured by Haber process?
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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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