1 potassium and 2 chlorines 2 potassiums and 1 chlorine 1 potassium and 1 chlorine 2 potassiums and 2 chlorines
K + Cl > KCl K + Cl2 > KCl2 K + Cl2 > 2KCl 2K + Cl2 > 2KCl
2 magnesiums and 2 bromines 1 magnesium and 2 bromines 2 magnesiums and 1 bromine 1 magnesium and 1 bromine
Mg + Br > MgBr2 Mg + Br2 > MgBr2 2Mg + 2Br > MgBr2 2Mg + Br > MgBr2
2 sodiums and 1 oxygen 2 sodiums and 2 oxygens 1 sodium and 1 oxygen 1 sodium and 2 oxygens
2Na + O2 > Na2O 2Na + O > Na2O 4Na + O2 > 2Na2O Na + O2 > Na2O
Fe2O3 + 2CO > Fe + CO2 Fe2O3 + 2CO > 2Fe + 2CO2 Fe2O3 + 3CO > 2Fe + 3CO2 2Fe2O3 + 4CO > 3Fe + 4CO2