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Enthalpies of formation of CO(g).CO(2)(g...

Enthalpies of formation of `CO(g).CO_(2)(g) and N_(2)O_(4)` are `-110,-393,81` and `9.7 kJ mol^(-1)` respectively. Find the value of `Delta_(r)H` for the reaction :
`N_(2)O_(4)(g)+3CO(g)rarrN_(2)O(g)+3Co_(2)(g)`

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`Delta_(r )H=SigmaDelta_(f)H("Products")-SigmaDelta_(f)H("Reactants")`
`=[Delta_(f)H(N_(2)O)+3Delta_(f)H(CO_(2))]-[Delta_(f)H(N_(2)O_(4))+3Delta_(f)H(CO)]`
`=[81+3(-393)]-[9.7+3(-110)] kJ=-777.7 kJ`
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