Which equation represents the N–H bond enthalpy in ?

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Which equation represents the N–H bond enthalpy in NH3\text{NH}_3? (1) NH3(g)→N(g)+3H(g)\text{NH}_3(\text{g})\rightarrow\text{N}(\text{g})+3\text{H}(\text{g}) (2) 13NH3(g)→13N(g)+H(g)\frac{1}{3}\text{NH}_3(\text{g})\rightarrow\frac{1}{3}\text{N}(\text{g})+\text{H}(\text{g}) (3) NH3(g)→12N2(g)+32H2(g)\text{NH}_3(\text{g})\rightarrow\frac{1}{2}\text{N}_2(\text{g})+\frac{3}{2}\text{H}_2(\text{g}) (4) NH3(g)→⋅NH2(g)+⋅H(g)\text{NH}_3(\text{g})\rightarrow\cdot\text{NH}_2(\text{g})+\cdot\text{H}(\text{g})

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