The first stage involves a gaseous equilibrium between the reactants (methane and steam), and some gaseous products - AQA - A-Level Chemistry - Question 9 - 2017 - Paper 1
Question 9
The first stage involves a gaseous equilibrium between the reactants (methane and steam), and some gaseous products. Figures 1 and 2 show the percentage conversion o... show full transcript
Worked Solution & Example Answer:The first stage involves a gaseous equilibrium between the reactants (methane and steam), and some gaseous products - AQA - A-Level Chemistry - Question 9 - 2017 - Paper 1
Step 1
Stage 1: Deductions from graph
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Answer
From Figure 1, as temperature increases, the percentage conversion of methane also increases, indicating that higher temperatures favor the conversion. Conversely, according to Figure 2, increasing pressure leads to a decrease in conversion, suggesting that high pressure is not favored for this reaction.
Step 2
Stage 2: Optimum temperature and explanation
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Answer
The optimum temperature for the reaction is around 780-800°C, as it provides a good balance between high conversion rates and reaction kinetics, allowing more effective production of gaseous products.
Step 3
Stage 3: Optimum pressure and explanation
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Answer
The optimum pressure should be between 1000-2000 kPa. Moderate pressure aids in the reaction without significantly compromising the conversion efficiency as indicated from the graph in Figure 2.
