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Chemical equilibria, Le Chatelier’s principle and Kc​

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Question 1

In the industrial production of hydrogen gas, methane is reacted with steam according to the following reversible reaction:

CH4(g)+H2O(g)⇌CO(g)+3H2(g)ΔH=+206 kJ mol−1 \text{CH}_4(g) + \text{H}_2\text{O}(g) \rightleftharpoons \text{CO}(g) + 3\text{H}_2(g) \quad \Delta H = +206\text{ kJ mol}^{-1} CH4​(g)+H2​O(g)⇌CO(g)+3H2​(g)ΔH=+206 kJ mol−1

Which combination of pressure and temperature will maximise the equilibrium yield of hydrogen gas?

A

High pressure and high temperature

B

High pressure and low temperature

C

Low pressure and high temperature

D

Low pressure and low temperature

Markscheme

Chemical equilibria, Le Chatelier’s principle and Kc Questions

  1. A Level
  2. /Chemistry
  3. /Chemical equilibria, Le Chatelier’s principle and Kc

24 exam-style questions on AQA A Level Chemistry Chemical equilibria, Le Chatelier’s principle and $K_c$, covering Chemical equilibria and Le Chatelier's principle and Equilibrium constant $K_c$ for homogeneous systems. Each one has a worked solution and a mark scheme showing where the marks go.

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