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N2O4 dissociates as ${\mathrm{N}}_{2}{\mathrm{O}}_{4}\left(\mathrm{g}\right)⇌2{\mathrm{NO}}_{2}\left(\mathrm{g}\right)$ at 273 K and 2 atm pressure. The equilibrium mixture has a vapour density of 41. What will be the percentage degree of dissociation ?

(1) 14.2%

(2) 16.2%

(3) 12.2%

(4) 87.8%