2 C2H6O2 (ℓ ethylene glycol) + 5 O2 (g) → 2 CO2 (g) + 3 H2O (ℓ)

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Reaction Type:

Combustion

Stoichiometry

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C2H6O2         Mass: g
O2             Mass: g  or Gas Volume: L
CO2            Mass: g  or Gas Volume: L
H2O            Mass: g

Enthalpy of Reaction

[2ΔHf(CO2 (g)) + 3ΔHf(H2O (ℓ))] - [2ΔHf(C2H6O2 (ℓ ethylene glycol)) + 5ΔHf(O2 (g))]
[2(-393.51) + 3(-285.83)] - [2(-454.8) + 5(0)] = -734.91 kJ
-734.91 kJ     (exothermic)

Entropy Change

[2ΔSf(CO2 (g)) + 3ΔSf(H2O (ℓ))] - [2ΔSf(C2H6O2 (ℓ ethylene glycol)) + 5ΔSf(O2 (g))]
[2(213.68) + 3(69.91)] - [2(166.94) + 5(205.03)] = -721.94 J/K
-721.94 J/K     (decrease in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[2ΔGf(CO2 (g)) + 3ΔGf(H2O (ℓ))] - [2ΔGf(C2H6O2 (ℓ ethylene glycol)) + 5ΔGf(O2 (g))]
[2(-394.38) + 3(-237.18)] - [2(-323.21) + 5(0)] = -853.88 kJ
-853.88 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-519.66 kJ     (spontaneous)

Equilibrium Constant, K (at 298.15 K)

3.9960207042321E+149
This process is favorable at 25°C.

Reference(s):

Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; p 226.

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