Ammonia Chemical Bonding Worksheet Page 13
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28(c)
Explain, as fully as you can, using the graph and your knowledge of the Haber process
why 450 °C and 200 atmospheres were chosen as conditions for this process.
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(8)
(Total 12 marks)
##
Ammonia is manufactured by the Haber Process, where nitrogen and hydrogen react
together as follows:
N
+
3H
2NH
2
2
3
The reaction is reversible. A balance is eventually reached when ammonia is being formed at
the same rate at which it is decomposing.
This point is called ‘equilibrium’.
PERCENTAGE OF AMMONIA AT EQUILIBRIUM
PRESSURE (ATM)
100° C
300° C
500° C
25
91.7
27.4
2.9
100
96.7
52.5
10.6
400
99.4
79,7
31.9
(a)
(i)
What is meant by a ‘reversible reaction’?
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(1)
(ii)
Which substances are present in the mixture at equilibrium?
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(1)
(b)
(i)
Under what conditions shown in the table is the maximum yield of
ammonia obtained?
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(2)
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