H2 (g)+Cl2 (g)→hυ2HCl (g)\mathrm{H}_{2}~(\mathrm{g})+\mathrm{Cl}_{2}~(\mathrm{g}) \xrightarrow{\mathrm{h \upsilon}} 2 \mathrm{HCl}~(\mathrm{g})H2 (g)+Cl2 (g)hυ2HCl (g)
H2 (g)+l2 (g)→Δ2Hl (g)\mathrm{H}_{2}~(\mathrm{g})+\mathrm{l}_{2}~(\mathrm{g}) \xrightarrow{\Delta} 2 \mathrm{Hl}~(\mathrm{g})H2 (g)+l2 (g)Δ2Hl (g)
2N2O5 (g)→Δ 4NO2 (g)+O2 (g)2 \mathrm{N}_{2} \mathrm{O}_{5}~(\mathrm{g}) \xrightarrow{\Delta}~ 4 \mathrm{NO}_{2}~(\mathrm{g})+\mathrm{O}_{2}~(\mathrm{g})2N2O5 (g)Δ 4NO2 (g)+O2 (g)
PCl5 (g)→ΔPCl3 (g)+Cl2 (g)\mathrm{PCl}_{5}~(\mathrm{g}) \xrightarrow{\Delta} \mathrm{PCl}_{3}~(\mathrm{g})+\mathrm{Cl}_{2}~(\mathrm{g})PCl5 (g)ΔPCl3 (g)+Cl2 (g)
