Ammonia Chemical Bonding Worksheet Page 3
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28(iii)
Ammonia is often made at a temperature of 450°C and at a pressure of
200 atmospheres.
Suggest two reasons why it is economical to make ammonia using these
conditions.
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(2)
(Total 10 marks)
Q2.
Methanol is a fuel that is used in some racing cars instead of petrol.
Methanol can be made from carbon monoxide and hydrogen. The equation for this reaction is
shown below.
CO(g)
+
2H
(g)
CH
OH(g)
2
3
The forward reaction is exothermic.
(a)
A high pressure (between 50 and 100 atmospheres) is used in this process.
Explain why the highest equilibrium yield of methanol is obtained at high pressure.
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(1)
(b)
The temperature used in this process is about 250 °C.
It has been stated that, ‘the use of this temperature is a compromise between the
equilibrium yield of product and the rate of reaction’.
Explain this statement.
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(3)
(Total 4 marks)
Page 3 of 28
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