Chemistry Practice Problems Gibbs Free Energy Practice Problems Solution: For the reaction Fe3O4 (s) + 4H2 (g) → 3Fe (s) + 4...

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Solution: For the reaction Fe3O4 (s) + 4H2 (g) → 3Fe (s) + 4H2O (g) ΔH° = 151.2 kJ and ΔS° = 169.4 J/K The standard free energy change for the reaction of 2.33 moles of Fe3O4(g) at 311 K, 1 atm would be ___________ kJ.This reaction is (reactant, product) ____________ favored under standard conditions at 311 K.Assume that ΔH° and ΔS° are independent of temperature. 

Problem

For the reaction 

Fe3O4 (s) + 4H2 (g) → 3Fe (s) + 4H2O (g) 

ΔH° = 151.2 kJ and ΔS° = 169.4 J/K 

The standard free energy change for the reaction of 2.33 moles of Fe3O4(g) at 311 K, 1 atm would be ___________ kJ.

This reaction is (reactant, product) ____________ favored under standard conditions at 311 K.

Assume that ΔH° and ΔS° are independent of temperature. 


Solution

We’re being asked to determine the standard free energy change (ΔG) for the reaction of 2.33 mol Fe3O4. The given reaction is:

Fe­3O4(s) + 4 H2(g)  3 Fe(s) + 4 H2O(g); ΔH˚ = 151.2 kJ, ΔS˚ = 169.4 J/K


In the balanced chemical equation, 1 mole of Fe3O4 reacts. We can calculate for ΔG˚ of 1 mole of Fe3O4 using the following equation:



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