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Edexcel A-Level Chemistry AS 9.11 Evaluate Data to Explain the Necessity for Many Industrial Processes to Reach a Compromise Between the Yield and the Rate Questions

Practise Edexcel IAL Chemistry 9.11 by evaluating how temperature, pressure and catalysts balance reaction rate, equilibrium yield and operating cost.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Explain why industrial temperature is a compromise between reaction rate and equilibrium yield.
  • Evaluate pressure and catalyst conditions in terms of rate, yield and operating cost.

Edexcel A-Level Chemistry AS 9.11 Evaluate Data to Explain the Necessity for Many Industrial Processes to Reach a Compromise Between the Yield and the Rate Questions question 1

[Maximum number: 5]

The Sabatier process uses carbon dioxide and hydrogen to produce methane and water.

CO2( g)+4H2( g)⇌CH4( g)+2H2O( g)ΔrH=−165 kJ mol−1\mathrm{CO}_{2}(\mathrm{~g})+4 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{~g}) \quad \Delta_{\mathrm{r}} H=-165 \mathrm{~kJ} \mathrm{~mol}^{-1}

The process is carried out at a temperature of 400∘C400^{\circ} \mathrm{C} and a pressure of 30 atm , in the presence of a nickel catalyst.

Discuss the advantages and disadvantages of using such high temperatures and pressures in the process.

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