CaO(s)+2HNO3(aq)⟶Ca(NO3)2(aq)+H2O(l)\mathrm{CaO}(\mathrm{s})+2 \mathrm{HNO}_{3}(\mathrm{aq}) \longrightarrow \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})CaO(s)+2HNO3(aq)⟶Ca(NO3)2(aq)+H2O(l)
N2 (g)+3H2 (g)→Fe,Al2O3500∘C,200 atm2NH3 (g)\mathrm{N}_{2}~(\mathrm{g})+3 \mathrm{H}_{2}~(\mathrm{g}) \xrightarrow[\mathrm{Fe}, \mathrm{Al}_{2} \mathrm{O}_{3}]{500^{\circ} \mathrm{C}, 200 \mathrm{~atm}} 2 \mathrm{NH}_{3}~(\mathrm{g})N2 (g)+3H2 (g)500∘C,200 atmFe,Al2O32NH3 (g)
NH3 (g)+5O2 (g)→900∘CPt4NO (g)+6H2O (g)\mathrm{NH}_{3}~(\mathrm{g})+5 \mathrm{O}_{2}~(\mathrm{g}) \xrightarrow[900^{\circ} \mathrm{C}]{\mathrm{Pt}} 4 \mathrm{NO}~(\mathrm{g})+6 \mathrm{H}_{2} \mathrm{O}~(\mathrm{g})NH3 (g)+5O2 (g)Pt900∘C4NO (g)+6H2O (g)
4NO (g)+2O2 (g)⟶4NO2 (g)4 \mathrm{NO}~(\mathrm{g})+2 \mathrm{O}_{2}~(\mathrm{g}) \longrightarrow 4 \mathrm{NO}_{2}~(\mathrm{g})4NO (g)+2O2 (g)⟶4NO2 (g)
