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Dynamic equilibria

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Question 1

In the industrial synthesis of methanol, carbon monoxide gas is reacted with hydrogen gas in a reversible reaction:

CO(g)+2H2(g)⇌CH3OH(g) \text{CO}(\text{g}) + 2\text{H}_2(\text{g}) \rightleftharpoons \text{CH}_3\text{OH}(\text{g}) CO(g)+2H2​(g)⇌CH3​OH(g)

The forward reaction is exothermic (releases heat energy).

The industrial conditions chosen for this synthesis are:

  • using excess hydrogen gas, rather than the exact 1:2 stoichiometric ratio
  • a pressure of 50 atm, rather than atmospheric pressure (1 atm)
  • a temperature of 250 °C, rather than room temperature.

Explain the effect of each of these chosen conditions on the equilibrium yield of methanol (CH3OH\text{CH}_3\text{OH}CH3​OH) and on the rate of reaching equilibrium.

[6]

Dynamic equilibria Questions

  1. GCSE
  2. /Chemistry
  3. /Dynamic equilibria

Practise Edexcel GCSE Chemistry Dynamic equilibria with exam-style questions for Foundation and Higher tier. 30 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank