The vapour density of a mixture containing ${\rm{N}}{{\rm{O}}^2}\,\,{\rm{and}}\,\,{N_2}{O_4}\,\,{\rm{is}}\,\,30.$ The mole function of ${N_2}{O_4}$ in mixture is $\underline {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} $

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