A pure sample of N2O4 (l) is introduced into an evacuated vessel. The vesse,

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of constant volume, is heated to? A pure sample of N2O4 (l) is introduced into an evacuated vessel. The vesse, of constant volume, is heated to a constant temperature such that the equilibrium below is established:

2NO2 (g) <---> 2NO (g) + O2 (g)

The value of the pressure p is then found to be 20% greater than if only NO2 (g) were present. Calculate the mole fraction, x, of oxygen in this equilibrium mixture.