Ammonia is manufactured using the Haber process: N₂(g) + 3H₂(g) ⇌ 2NH₃(g), ΔH = −92 kJ/mol. The graph shows how the yield of ammonia changes with pressure at constant temperature.

1. aState two conditions required for the manufacture of ammonia by the Haber process. [2]
2. bWhat conclusion can be drawn from the graph? [1]
3. cState and explain how increasing the temperature affects the amount of ammonia produced in the process. [2]

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