For Which One Of The Following Reactions Is H Rxn Equal To The Heat Of Formation

For which one of the following reactions is ΔH°rxn equal to the heat of formation of the product?

N2 (g) + 3H2 (g) → 2NH3 (g)

(1/2) N2 (g) + O2 (g) → NO2 (g)

P (g) + 4H (g) + Br (g) → PH4Br (l)

12C (g) + 11H2 (g) + 11O (g) → C6H22O11 (g)

6C (s) + 6H (g) → C6H6 (l)

 

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