C15.5-C15.6 (Haber Process) Flashcards
What is ammonia imporant for
Makes other products including fertilisers (that contain nitrogen for the plants)
What is ammonia made up from (in the Harber Process)
Nitrogen and hydrogen
At what pressure and temperature is the Harber Process carried out
450°C
200 atmospheres pressure
(Using an iron catalyst)
Is the Harber Process reversible and what does that mean?
Yes, this means that the ammonia gas made breaks again into nitrogen and hydrogen.
(The hydrogen and nitrogen and then recycled)
How is ammonia removed
By cooling the gases so that the ammonia liquifies
It can be seperated from the hydrogen and nitrogen gas
The effect of a catalyst (in the harber process)
Iron catalyst used (but speeds up both the forward and reverse reaction) therefore actual yield is not affected, but it does cause ammonia to be produced at a faster rate (important economic considerstion in industry)
Why does the Harber Process use an atmospheric pressure of 200
Greater the pressure the more products being formed (ammonia) to counter the change (mol ratio of 4:2)
Why don’t they use a higher pressure in the Harber Process?
- Expensive (thicker, stronger reaction vessels required to with stand the pressure)
- Dangerous (increasing the pressure could result in an explosion)
Is the forward reaction of the Harber Process exo or endothermic?
Exothermic
Where is nitrogen taken from
The air
Where is hydrogen taken from (for Harber Process)
Mainly from natural gas (which conatins Methane, CH4)
What is an advantage of using a lower temperaure in the Haber Process
Would increase amount of ammonia at equilibrium (forward reaction is exothermic)
Why is a disadvantage of having low temperature in the Haber Process (better to have a high temperature)
Higher the temperature the higher the rate of reaction (more kenetic energy= more frequent succesful collisions).
