what is the equation for rust
The overall chemical equation for the formation of rust is. Iron + water + oxygen rust. 4 Fe(s) + 6 H 2 O(l) + 3 O 2 (g) 4 Fe(OH) 3 (s). Iron(III) hydroxide, Fe(OH) 3 then dehydrates to produce Fe 2 O 3 .nH 2 O(s) or rust.