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The value of Delta(f) H^(Θ) for NH(3) is...

The value of `Delta_(f) H^(Θ)` for `NH_(3)` is `-91.8 kJ mol^(-1)`. Calculate enthalpy change for the following reaction.
`2NH_(3) (g) rarr N_(2) (g) + 3H_(2) (g)`

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