In a container initially only `N_(2)O_(4)` is present and no difference in height of Hg-column of two limbs :
If due to dissociation of `N_(2)O_(4)` at constant temperature the difference in the column of mercury becomes 7.6 cm then calculate `%` dissociation of `N_(2)O_(4).[N_(2)O_(4) rarr 2NO_(2)]`