Question

The chemical formula of rust is?
(a) Fe2O3
(b) Fe
(c) FeO
(d) FeSO4

Answer 1

Answer:

Fe2O3.

Explanation:

Answer 2

Answer:

A) Fe2O3

Explanation:

The chemical equations for rust formation

2Fe(s) + 2H2O(l) + O2(g) 2Fe2+(aq) + 4OH-(aq)

Fe2+(aq) + 2OH-(aq) Fe(OH)2(s)

Fe(OH)2(s) =O2=> Fe(OH)3(s)

Fe(OH)3(s) =dehydrates=> Fe2O3.nH2O(s) or rust

The chemical formula for rust is Fe2O3.nH2O

The overall chemical equation for the formation of rust is

Iron + water + oxygen rust

4 Fe(s) + 6 H2O(l) + 3 O2(g) 4 Fe(OH)3(s)

Iron(III) hydroxide, Fe(OH)3 then dehydrates to produce Fe2O3.nH2O(s) or rust

(n can be any whole number)