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A given sample of N(2)O(4) in a closed v...

A given sample of `N_(2)O_(4)` in a closed vessel shows `20%` dissociation in `NO_(2)` at `27^(@)C` and `760 "torr"`. The sample is now heated upto `127^(@)C` and the analysis of mixture shows `60%` dissociation at `127^(@)C`.
The heat of dissociation of `N_(2)O_(4)` (in `kcal mol^(-1)`) in this temperature range is :

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