
Let x be the change in concentration to reach equilibrium.
Hence, At equilibrium:
[N_{2}O_{4}] = initial concentration  change in concentration = 5.5 x 10^{2}  X
[NO_{2}] = initial concentration + change in concentration = 0 + 2X
Hence, equilibrium constant expression will be given by:
Solving for x we get:
Therefore, Equilibrium concentrations will be:
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