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Enthalpies of formation of CO(g),CO2(g),...

Enthalpies of formation of CO(g),`CO_2(g),N_2O(g)` and `N_2O_4(g)` are -110,-393,81 and `9.7KJ mol^(-1)` respectively calculate `Delta H_r` for the reaction :`N_2O_4(g)+3CO(g)rarr N_2O(g)+3CO_2(g)`

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`Delta_(r)H=sumDelta_(f)H("Products")-sumDelta_(f)H("Reactants")`
`=3Delta_(f)H[CO_(2)(g)]+Delta_(f)H[N_(2)O(g)]`
`-Delta_(f)H[N_(2)O_(4)(g)]+3Delta_(f)H[CO(g)]`
`=[3(-393)+1(81)-1(9.7)-3(-110)]=-777.77kJ`
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