PCl5⇌PCl3+Cl2\mathrm{PCl}_{5}\rightleftharpoons \mathrm{PCl}_{3}+\mathrm{Cl}_{2}PCl5⇌PCl3+Cl2
2SO2+O2⇌2SO32 \mathrm{SO}_{2}+\mathrm{O}_{2} \rightleftharpoons2 \mathrm{SO}_{3}2SO2+O2⇌2SO3
N2+3H2⇌2NH3\mathrm{N}_{2}+3 \mathrm{H}_{2} \rightleftharpoons2 \mathrm{NH}_{3}N2+3H2⇌2NH3
H2+I2⇌2HI\mathrm{H}_{2}+\mathrm{I}_{2} \rightleftharpoons 2 \mathrm{HI}H2+I2⇌2HI