Ammonia is produced from hydrogen and nitrogen, according to the equation:
$$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$$
The graph shows the yield of ammonia produced at 200°C and 100 kPa - HSC - SSCE Chemistry - Question 14 - 2002 - Paper 1
Question 14
Ammonia is produced from hydrogen and nitrogen, according to the equation:
$$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$$
The graph shows the yield of ammonia pr... show full transcript
Worked Solution & Example Answer:Ammonia is produced from hydrogen and nitrogen, according to the equation:
$$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$$
The graph shows the yield of ammonia produced at 200°C and 100 kPa - HSC - SSCE Chemistry - Question 14 - 2002 - Paper 1
Step 1
Identify the Effects of Temperature on Yield
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Answer
Ammonia production is affected by temperature due to Le Chatelier's principle. Increasing the temperature generally favors endothermic reactions and may decrease product yield for exothermic reactions. Since producing ammonia is exothermic, a higher temperature of 400°C will likely result in a lower yield compared to 200°C under the same pressure.
Step 2
Analyze the Graph Options
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Answer
When reviewing the graph options given (A, B, C, D), we need to determine which graph correctly represents the decrease in yield at 400°C compared to 200°C. The correct graph should indicate that at 400°C, the yield of ammonia is less than that at 200°C.
Step 3
Select the Correct Graph
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Answer
Upon evaluating the options, Option C shows that the yield at 400°C is less than the yield at 200°C, aligning with the expectation based on temperature effects on the reaction. Therefore, Option C is the correct answer.
