Skip to content
Clear highlightsClear Highlight Report a problem

The Haber Process

The Haber process is used in the manufacture of ammonia from nitrogen gas and hydrogen gas.N2(g) + 3H2(g) ⇌ 2NH3 (g) ΔH = -92kJmol-1Using Le Chatelier's principle, the best conditions for a high yield are a low temperature and high pressure. Both will push the equilibrium to the right.A compromise temperature of 350 - 500°C is used so the reaction proceeds at an appreciable rate and a pressure of 100-200atm is used. An iron catalyst is used to speed up the reaction. The yield is about 15% and the gases are recycled.

Read the text

Read the text and highlight anything you think is important. When you go on, the text is hidden and you answer from memory.

Next

Specification: OCR Chemistry A (H032), AS-level, 3.2.3 Chemical equilibrium. Topic: Equilibrium.

Key terms in this lesson

Catalyst
A substance that increases the rate of a chemical reaction without being used up, by providing an alternative reaction pathway with a lower activation energy.
Le Chatelier's principle
The principle that when a system at equilibrium is subjected to a change, the system readjusts to minimise the effect of that change.

More in Equilibrium

All 10 lessons in Equilibrium · All OCR AS-level Chemistry topics