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In a flask, colourless N(2)O(4) is in eq...

In a flask, colourless `N_(2)O_(4)` is in equilibrium with brown-coloured `NO_(2)`. At equilibrium, when the flask is heated to `100^(@)C` the brown colour deepens and on cooling, the brown colour became less coloured. The change in enthalpy `DeltaH` for the ayatem is

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