8 mole of a mixture of `N_(2), NO_(2)` and `N_(2)O_(4)` has a mean molecular mass of `(378)/(8)` . On heating to a temperature a

8 mole of a mixture of `N_(2), NO_(2)` and `N_(2)O_(4)` has a mean molecular mass of `(378)/(8)` . On heating to a temperature at which `N_(2)O_(4)` dissociated completely `(N_(2)O_(4)rarr 2NO_(2))` , the mean molecular mass become `(378)/(9)`.
The ratio of number of moles of `N_(2): NO_(2):N_(2)O_(4)` in original mixture is :
A. `3:4:1`
B. `2:5:1`
C. `3:5:2`
D. `4:2:3`

8 mole of a mixture of `N_(2), NO_(2)` and `N_(2)O_(4)` has a mean molecular mass of `(378)/(8)` . On heating to a temperature at which `N_(2)O_(4)` d

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