4 FeO (s) + 1 O2 (g) → 2 Fe2O3 (s hematite)

Back to reactions list

 

Reaction Type:

Synthesis

Stoichiometry

Enter a mass or volume in one of the boxes below. Upon hitting submit, the stoichiometric equivalents will be calculated for the remaining reactants and products. All gases are assumed to be at STP.

FeO            Mass: g
O2             Mass: g  or Gas Volume: L
Fe2O3          Mass: g
Heat Released: kJ

Enthalpy of Reaction

[2ΔHf(Fe2O3 (s hematite))] - [4ΔHf(FeO (s)) + 1ΔHf(O2 (g))]
[2(-824.25)] - [4(-271.96) + 1(0)] = -560.66 kJ
-560.66 kJ     (exothermic)

Entropy Change

[2ΔSf(Fe2O3 (s hematite))] - [4ΔSf(FeO (s)) + 1ΔSf(O2 (g))]
[2(87.4)] - [4(60.75) + 1(205.03)] = -273.23 J/K
-273.23 J/K     (decrease in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[2ΔGf(Fe2O3 (s hematite))] - [4ΔGf(FeO (s)) + 1ΔGf(O2 (g))]
[2(-742.24)] - [4(-251.46) + 1(0)] = -478.64 kJ
-478.64 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-479.20 kJ     (spontaneous)

Equilibrium Constant, K (at 298.15 K)

7.2238044634e+083
This process is favorable at 25°C.

Reference(s):

Zumdahl, Steven and Zumdahl, Susan A. Chemistry 9th ed.; Brooks/Cole: Belmont, CA, 2014; p 131.

Back to list of reactions