2 C (s graphite) + 1 O2 (g) → 2 CO (g)

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Reaction Type:

Synthesis

Stoichiometry

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C              Mass: g
O2             Mass: g  or Gas Volume: L
CO             Mass: g  or Gas Volume: L

Enthalpy of Reaction

[2ΔHf(CO (g))] - [2ΔHf(C (s graphite)) + 1ΔHf(O2 (g))]
[2(-110.54)] - [2(0) + 1(0)] = -221.08 kJ
-221.08 kJ     (exothermic)

Entropy Change

[2ΔSf(CO (g))] - [2ΔSf(C (s graphite)) + 1ΔSf(O2 (g))]
[2(197.9)] - [2(5.69) + 1(205.03)] = 179.39 J/K
179.39 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[2ΔGf(CO (g))] - [2ΔGf(C (s graphite)) + 1ΔGf(O2 (g))]
[2(-137.28)] - [2(0) + 1(0)] = -274.56 kJ
-274.56 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-274.57 kJ     (spontaneous)

Equilibrium Constant, K (at 298.15 K)

1.269133806e+048
This process is favorable at 25°C.

Reference(s):

Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; pp 138, 204.
Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 372.
Kotz, John C. and Treichel, Paul. Chemistry & Chemical Reactivity 4th ed.; Thomson Brooks/Cole: Belmont, CA, 1999; p 157.

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