Problem: Calculate the standard change in Gibbs free energy for the following reaction at 25 °C. 6 Cl2(g) + 2Fe2O3 (s) → 4 FeCl3(s) + 3 O2(g)

FREE Expert Solution

We can use the following equation to solve for ΔG˚rxn:

G°rxn = G°prod-G°react 

Note that we need to multiply each G° by the stoichiometric coefficient since G˚ is in kJ/mol. 


The given reaction is

6 Cl2(g) + 2Fe2O3 (s) → 4 FeCl3(s) + 3 O2(g)


From textbook or internet, we have

ΔG° Cl2(g = 0

ΔG° Fe2O3 (s) = -742.2 kJ/mol

ΔG° FeCl3(s) = -334.0 kJ/mol

ΔG° O2(g) = 0

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Problem Details

Calculate the standard change in Gibbs free energy for the following reaction at 25 °C. 

6 Cl2(g) + 2Fe2O3 (s) → 4 FeCl3(s) + 3 O2(g)

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