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Given N(2)(g)+3H(2)(g)rarr2NH(3)(g),De...

Given
`N_(2)(g)+3H_(2)(g)rarr2NH_(3)(g),Delta_(r)H^(Ө)= -92.4 kJ mol^(-1)`
What is the standard enthalpy of formation of `NH_(3)` gas?

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Reaction for the enthalpy of formation of `NH_(3)(g)` is
`1/2N_(2)(g)+3/2H_(2)(g)rarr NH_(3)(g)`
`:. Delta_(f)H^(Θ)=-92.4//2=-46.2 kJ mol^(-1)`
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