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5.3 Equilibria

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Question 25
H

Sulfur trioxide is made from sulfur dioxide and oxygen.

2SO2(g)+O2(g)⇌2SO3(g) \mathrm{2SO_{2}(g) + O_{2}(g) \rightleftharpoons 2SO_{3}(g)} 2SO2​(g)+O2​(g)⇌2SO3​(g)

More oxygen is added to an equilibrium mixture. The temperature and volume are kept the same.

Which statement is correct when equilibrium is reached again?

[1]
A

There is more sulfur trioxide, and a greater percentage of the sulfur dioxide has been converted.

B

There is more sulfur trioxide, but the percentage of sulfur dioxide converted is unchanged.

C

There is no change, because oxygen is already present in the mixture.

D

There is less sulfur trioxide, because there are more molecules of gas on the left.

Markscheme

5.3 Equilibria Questions

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

47 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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