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The enthalpy of formation of CO(g), CO2(...

The enthalpy of formation of CO(g), `CO_2(g) , N_2O(g), N_2O_4(g)` are -110, -393, 81 and 9.7 kJ `mol^-1` respectively.`N_2O_4`+3CO(g) `->``N_2`O(g)+3`CO_2`(g). ``Find ` the ` `value ` `of ` ` ``Delta``rH` for the reaction:

A

666.6kJ `mol^-1`

B

-777.7kj`mol^-1`

C

777.7kj`mol^-1`

D

-666.6kJ `mol^-1`

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