13. For which one of the following reactions is AH°;°rxn equal to the heat of formation of theproduct? \text { A) } \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NH} 3(\mathrm{~g}) \text {

B) }(1 / 2) \mathrm{N}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{NO}_{2}(\mathrm{~g}) \text { C) } 6 \mathrm{C}(\mathrm{s})+6 \mathrm{H}(\mathrm{g}) \rightarrow \mathrm{C}_{6} \mathrm{H}_{6}(1) \text { D) } \mathbf{P}(\mathbf{g})+4 \mathbf{H}(\mathbf{g})+\mathbf{B r}(\mathbf{g}) \rightarrow \mathbf{P H} \mathbf{4} \mathbf{B r}(\mathbf{l}) \text { E) } 12 C(g)+11 H_{2}(g)+11 O(g) \rightarrow C_{6} H_{22} O_{11}(g)