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The standard enthalpy of formation of CO...

The standard enthalpy of formation of `CO (g), CO_2 (g) , N_2O (g) " and " N_2O_4 (g)` are respectively - 10 . 393, 81 and -10 kJ `"mol"^(-1)` . Enthalpy change (in kJ) of the follwing reaction is
`N_2O_4(g) + 3CO (g) to N_2O(g) + 3CO_2 (g)`

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