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Question

Al is costlier than Fe but Al is sacrificed to convert Fe2O3 into Fe.

ΔGf(Fe2O3)=742.2kJmol1ΔGf(Al2O3)=1582kJmol1

Write the reaction involved and comment on the feasibility of the reaction.

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Solution

A displacement reaction takes place between Fe and Al, where Al replaces Fe from its oxide (Fe2O3).

The balanced chemical equation is:

2Al(s)+Fe2O3(s)2Fe(s)+Al2O3(s)
ΔG=ΔGproductΔGreactant

=ΔGAl2O3+2ΔGFeΔGFe2O32ΔGAl=1582+0(742.2)0=840 kJ
The reaction is spontaneous (ΔGrexn<0) and hence feasible.


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