At $27^{\circ }\mathrm{C}$ and $1\mathrm{atm}$, $\mathrm{N}{}_2\mathrm{O}{}_4$ is $20\%$ dissociated into $\mathrm{NO}{}_2$. The vapour density of the equilibrium mixture is (molar mass of $\mathrm{N}{}_2\mathrm{O}{}_4$ = 92)

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