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

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

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`Delta_(r)H = Sigma Delta_(f)H(`Products) `-Sigma Delta_(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)]`
`= [8] +3 ( -393)] - [9.7 +3( -110) ] kJ = -777.7 kJ`
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