12H2( g)+12I2( g)⇌HI(g)\frac{1}{2} \mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{I}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{HI}(\mathrm{g})21H2( g)+21I2( g)⇌HI(g)
12 N2( g)+32H2( g)⇌NH3( g)\frac{1}{2} \mathrm{~N}_{2}(\mathrm{~g})+\frac{3}{2} \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{NH}_{3}(\mathrm{~g})21 N2( g)+23H2( g)⇌NH3( g)
PCl5( g)⇌PCl3( g)+Cl2( g)\mathrm{PCl}_{5}(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g})PCl5( g)⇌PCl3( g)+Cl2( g)
2SO2( g)+O2( g)⇌2SO3( g)2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g})2SO2( g)+O2( g)⇌2SO3( g)