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At the equilibrium of the reaction , ...

At the equilibrium of the reaction ,
`N_(2)O_(4)(g)rArr2NO_(2)(g)`, the observed molar mass of `N_(2)O_(4)` is 77.70 g . The percentage dissociation of `N_(2)O_(4)` is :-

A

28 .4

B

46 .7

C

22.4

D

18 .4

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