One of the most recognizable corrosion reactions is the rusting of iron. rust is caused by iron reacting with oxygen gas in the presence of water to create an oxide layer. iron can form several different oxides, each having its own unique color. red rust is caused by the formation of iron(iii) oxide trihydrate. in the space provided, write the balanced reaction for the formation of fe2o3•3h2o(s). phases are optional.