H2( g)+Br2( g)⇌2HBr(g)\mathrm{H}_{2}(\mathrm{~g})+\mathrm{Br}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{HBr}(\mathrm{g})H2( g)+Br2( g)⇌2HBr(g)
2NO2( g)+7H2( g)⇌2NH3( g)+4H2O(g)2 \mathrm{NO}_{2}(\mathrm{~g})+7 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})2NO2( g)+7H2( g)⇌2NH3( g)+4H2O(g)
CO2( g)+C(s)=2CO(g)\mathrm{CO}_{2}(\mathrm{~g})+\mathrm{C}(\mathrm{s})=2 \mathrm{CO}(\mathrm{g})CO2( g)+C(s)=2CO(g)
CaCO3( s)=CaO(s)+CO2( g)\mathrm{CaCO}_{3}(\mathrm{~s})=\mathrm{CaO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g})CaCO3( s)=CaO(s)+CO2( g)