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Chemical equilibrium

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Question 13

One stage in the oxidation of nitrogen monoxide involves the equilibrium between nitrogen monoxide, oxygen, and nitrogen dioxide:

2NO(g)+O2(g)⇌2NO2(g) 2\text{NO}(\text{g}) + \text{O}_2(\text{g}) \rightleftharpoons 2\text{NO}_2(\text{g}) 2NO(g)+O2​(g)⇌2NO2​(g)

This equilibrium is investigated:

  • Step 1: 8.40×10−2 mol8.40 \times 10^{-2}\text{ mol}8.40×10−2 mol of NO\text{NO}NO is mixed with 9.20×10−2 mol9.20 \times 10^{-2}\text{ mol}9.20×10−2 mol of O2\text{O}_2O2​ in a 4.00 dm34.00\text{ dm}^34.00 dm3 container.
  • Step 2: The container is sealed and allowed to reach equilibrium at constant temperature.
  • Step 3: At equilibrium, 6.40×10−2 mol6.40 \times 10^{-2}\text{ mol}6.40×10−2 mol of NO2\text{NO}_2NO2​ is formed.

Determine the equilibrium concentrations of NO\text{NO}NO, O2\text{O}_2O2​, and NO2\text{NO}_2NO2​, 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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