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Enthalpies of formation of CO(g), CO2(g), N2O(g) and N2O4(g) are –110, – 393, 

– 81 and 9.7 KJ/mol respectively. Find the value of ΔrH for the reaction: 

N2O4(g) + 3CO(g) → N2O(g) + 3CO2(g)

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 the value of ΔrH for the reaction: 

-777.7 KJ

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