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Figure D shows the relationship between pressure (in atmospheres) and the percentage yield of ammonia at different temperatures ranging from 350°C to 550°C - HSC - SSCE Chemistry - Question 14 - 2006 - Paper 1
Question 14
Figure D shows the relationship between pressure (in atmospheres) and the percentage yield of ammonia at different temperatures ranging from 350°C to 550°C. The curv... show full transcript
Worked Solution & Example Answer:Figure D shows the relationship between pressure (in atmospheres) and the percentage yield of ammonia at different temperatures ranging from 350°C to 550°C - HSC - SSCE Chemistry - Question 14 - 2006 - Paper 1
Step 1
Describe the graph in Figure D.
Answer
Figure D illustrates the yield of ammonia (in percentage) plotted against pressure (in atmospheres) at various temperatures, specifically 350°C, 400°C, 450°C, and 500°C. It is evident that the yield is higher at lower pressures for higher temperatures while showing a diminishing yield at lower temperatures when pressure increases.
Step 2
Explain the trend observed at different temperatures.
Answer
At higher temperatures (e.g., 550°C), the yield of ammonia gradually decreases with increasing pressure, indicating that the reaction may be equilibrium-related, where increased temperature results in less favorable conditions for the synthesis reaction. Conversely, at lower temperatures, an increase in pressure tends to raise the yield of ammonia, indicating that the forward reaction is favored under these conditions.