Chemisrty Unit 3.5 Ammonia (Haber Process).

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What is ammonia made up of?
Hydrogen, and nitrogen.
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Describe the conditions used for the process.
200atm, 450*C, in the prescense of a iron catalyst.
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Describe rate of reaction, when pressure is increased.
One mole of H, and two moles of N ---> two moles of NH3. Higher pressure increases yield of ammonia.
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Describe the iron catalyst.
Speeds up rate of reaction, but, it has NO EFFECT on production of ammonia.
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How is the ammonia removed from the system? What happens to the unreacted H2, and N?
Removed by cooling (forms a liquid). Unreacted H2, and N are recycled back into the system.
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Describe Le Chatelier's principle.
Le Chatelier stated that a system will shift equilibrium to oppose any change placed upon the system.
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The the equilibrium: temperature.
For every reversible reaction one direction will always be exothermic (-ve ΔH) and the other way will always be endothermic (+ve ΔH). Increasing/decreasing temp. will cause the system to oppose the change.
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Describe the equilibrium: pressure.
If we increase the pressure then equilibrium will shift to oppose this change. The reaction which results in the fewest number of moles will be favoured as this lead to a reduction in pressure. Descrease pressure will favour side with most moles fav.
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Describe the temperature compromise.
Low Temperature •Using low temperature will shift the equilibrium to favour the exothermic reaction. The forward reaction is exothermic (-ve ΔH) so more products will be produced, this will oppose the change. Too low a temp.
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Describe the pressure compromise.
High Pressure. This will shift equilibrium to favour forwards reaction which leads to fewer number of moles. However, too high a pressure is expensive.
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Other cards in this set

Card 2

Front

Describe the conditions used for the process.

Back

200atm, 450*C, in the prescense of a iron catalyst.

Card 3

Front

Describe rate of reaction, when pressure is increased.

Back

Preview of the front of card 3

Card 4

Front

Describe the iron catalyst.

Back

Preview of the front of card 4

Card 5

Front

How is the ammonia removed from the system? What happens to the unreacted H2, and N?

Back

Preview of the front of card 5
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ellybeanzz

The only reason this has a star is because you cant not give a star

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