The chemical reaction that causes iron to rust in air is given by 4Fe+3O2?2Fe2O3

ID: 704153 • Letter: T

Question

The chemical reaction that causes iron to rust in air is given by

4Fe+3O2?2Fe2O3

in which

=?543.7 J/K

1. What is the Gibbs free energy for this reaction at 3200 K? Assume that ?H and ?S do not change with temperature.

2. At what temperature Teq do the forward and reverse rusting reactions occur in equilibrium?

?Hrxn? =?1648.4 kJ ?Srxn?

=?543.7 J/K

1. What is the Gibbs free energy for this reaction at 3200 K? Assume that ?H and ?S do not change with temperature.

2. At what temperature Teq do the forward and reverse rusting reactions occur in equilibrium?

As we know that Delta Grxn =Delta Hrxn - T Delta Srxn

= - 1648.4 x1000-(-543.7x3200)

=-1648400+1739840

=91440 k

= 91.44 kj

Teq= Delta Hrxn /Delta Srxn

= -1648400/-543.7

Teq = 3031.8 K

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.