What is the standard Gibbs free energy for this reaction? In kJ/mol At what temperature T_eq do the forward and reverse rusting reactions occur in equilibrium? In Kelvin?
The chemical reaction that causes iron to rust in air is given by
4Fe + 3O₂ → 2Fe₂O₃
in which
ΔHrxn⁰ =-1648.4 kJ/mol
ΔSrxn⁰ = -543.7 J/mol*K
The chemical reaction that causes iron to rust in air is given by
4Fe + 3O₂ → 2Fe₂O₃
in which
ΔHrxn⁰ =-1648.4 kJ/mol
ΔSrxn⁰ = -543.7 J/mol*K
1 Answer
May 2, 2016
Explanation:
Under standard conditions
At equilibrium
- assuming the enthalpy and entropy changes don't change much with temperature we can use the standard values.
Strictly speaking, that is not the equation for rusting. This requires both air and water and the product, rust, is hydrated iron(III) oxide
