GCSE / O Levels Chemistry

Ammonia is manufactured by the Haber process.
N2(g) + 3H2(g) 2NH3(g)
AH = -92 kJ/mol
For this reaction, which rows give a true statement together with a correct reason?
statement
reason
Nitrogen and hydrogen are mixed
in the ratio 1:3 by volume.
1
The formula of ammonia is NH3.
The pressure used is
approximately 200 atmospheres.
2
A high pressure is needed to produce
a good yield of ammonia at equilibrium.
A high temperature is needed to produce
a good yield of ammonia at equilibrium.
3
The temperature used is
approximately 450 °C.
Vanadium(V) oxide is
used as a catalyst.
A catalyst speeds up the
rate of the reaction.
4
A 1 and 2 only
B 2 and 3 only
C 3 and 4 only
D 1, 2 and 3 only


Properties and Uses of Ammonia | 2019 - M/J - 5070/12 | Q24