No but I'm having a little trouble understanding the problem. Look up the dHo formation for NH3. I'll call that x. IF THE problem is asking for dH rxn it is
N2(g) + 3H2(g) ==> 2NH3(g) + 2x kJ
BUT IF THE problem wants dHo formation for NH3/mol it is
1/2 N2(g) + 3/2 H2(g) ==> NH3 + x
That "equal to and defined by the quantity" makes me think it is the latter but I'll leave it to you to decipher.
Write the balanced chemical reaction (showing appropriate symbols and states) for the chemical reaction with enthalpy change equal to and defined by the quantity dHformation [NH3(g)]
N2(g) + 3H2(g) --> 2NH3(g)
Is that all the question is asking for?
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