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Chemical equilibrium

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Question 18

One stage in the contact process for making sulfuric acid involves the reversible oxidation of sulfur dioxide:

2SO2(g)+O2(g)⇌2SO3(g) 2\text{SO}_2(\text{g}) + \text{O}_2(\text{g}) \rightleftharpoons 2\text{SO}_3(\text{g}) 2SO2​(g)+O2​(g)⇌2SO3​(g)

This equilibrium is investigated:

  • Step 1: 1.20×10−1 mol1.20 \times 10^{-1}\text{ mol}1.20×10−1 mol of SO2\text{SO}_2SO2​ is mixed with 9.50×10−2 mol9.50 \times 10^{-2}\text{ mol}9.50×10−2 mol of O2\text{O}_2O2​ in a 5.00 dm35.00\text{ dm}^35.00 dm3 container.
  • Step 2: The container is sealed and allowed to reach equilibrium at constant temperature.
  • Step 3: At equilibrium, 8.00×10−2 mol8.00 \times 10^{-2}\text{ mol}8.00×10−2 mol of SO3\text{SO}_3SO3​ is formed.

Determine the equilibrium concentrations of SO2\text{SO}_2SO2​, O2\text{O}_2O2​, and SO3\text{SO}_3SO3​, and calculate the value of KcK_cKc​, including units.

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Markscheme

Chemical equilibrium Questions

  1. A Level
  2. /Chemistry
  3. /Chemical equilibrium

23 exam-style questions on OCR A A Level Chemistry Chemical equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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