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Given that N2(g)+3H2(g)rarr2NH3 DeltarH...

Given that
`N_2(g)+3H_2(g)rarr2NH_3 Delta_rHtheta=-92.4`
What is the sandard enthalpy of formation of `NH_3` gas?

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`DeltaH^0` for the formation of 2 moles of `NH_3` from its elements=-92.4 KJ`therefore`
`DeltaH^0` for the formation of 1 mole of `NH_3` from its elements (i.e. standard enthalpy of fromation of `NH_3`=92.4/2=-46.2 kJ mol^-1`
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