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5.3 Equilibria

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Question 26

Ethane can break down into ethene and hydrogen in a sealed reaction vessel.

C2H6(g)⇌C2H4(g)+H2(g) \mathrm{C_{2}H_{6}(g) \rightleftharpoons C_{2}H_{4}(g) + H_{2}(g)} C2​H6​(g)⇌C2​H4​(g)+H2​(g)

The table shows the percentage of ethane converted to ethene at equilibrium. The same initial amount of ethane is used in each experiment.

Temperature in °CPressure in kPaEthane converted in %
60010017
6005008
80010070
80050041

An engineer makes three suggestions for increasing the amount of ethene at equilibrium:

  • operate at 600 °C instead of 800 °C
  • increase the pressure from 100 kPa to 500 kPa
  • add more ethane to the equilibrium mixture

Evaluate the three suggestions.

[4]
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5.3 Equilibria Questions

  1. GCSE
  2. /Chemistry
  3. /5.3 Equilibria

124 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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