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Edexcel IAL Chemistry 13.9 Magnitude of equilibrium constants

Describe very large K as equilibrium far to products and very small K as far to reactants, while treating moderate values as mixtures rather than complete conversion.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Use a very large K value to justify that equilibrium lies far toward products.
  • Interpret a moderate K as appreciable reactant and product amounts rather than completion.

13.9—Apply knowledge of the value of equilibrium constants to predict the extent to which a reaction takes place question 1

[Maximum number: 2]

This question is about the reaction between nitrogen monoxide and oxygen.

NO( g)+1/2O2( g)⇌NO2( g)\mathrm{NO}(\mathrm{~g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{NO}_{2}(\mathrm{~g})

The equilibrium constant, KpK_{p}, for the reaction at 298 K is 1.55×106 atm−1/21.55 \times 10^{6} \mathrm{~atm}^{-1 / 2}.

State what this value of the equilibrium constant indicates about the position of the equilibrium. Justify your answer.

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