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Ammonia is an important fertiliser. Large amounts are prepared from hydrogen and nitrogen in industry.
10.1 For the industrial preparation of ammonia, write down:
10.1.1 The name of the process used (1)
10.1.2 A balanced equation for the reaction that occurs (3)
10.1.3 The source of nitrogen (1)
10.2 The yield of ammonia changes with temperature and pressure during its industrial preparation. The graphs below show how the percentage of ammonia in the reaction mixture that leaves the reaction vessel varies under different conditions.
10.2.1 Use the appropriate graph to estimate the percentage of ammonia present in the reaction mixture at 240 atmosphere and 400 °C. (1)
10.2.2 State TWO advantages of using high pressure in the preparation of ammonia. (2)
10.2.3 The advantage of using a low temperature is the large percentage of ammonia formed. What is the disadvantage of using a low temperature? (1)
10.3 Ammonia is also used in the preparation of other fertilisers such as ammonium nitrate. Calculate the mass of nitrogen in a 50 kg bag of pure ammonium nitrate fertiliser. (3)
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TOTAL: 150