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5.3 Equilibria

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Question 13
F

Dinitrogen tetroxide breaks down into nitrogen dioxide in a reversible reaction.

N2O4(g)⇌2NO2(g) \mathrm{N_{2}O_{4}(g) \rightleftharpoons 2NO_{2}(g)} N2​O4​(g)⇌2NO2​(g)

A model of a sealed flask contains 100 molecules of N2O4\mathrm{N_{2}O_{4}}N2​O4​ and nothing else. When the mixture reaches equilibrium, 60 molecules of N2O4\mathrm{N_{2}O_{4}}N2​O4​ are left.

What is the total number of molecules in the flask at equilibrium?

[1]
A

100

B

140

C

160

D

180

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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