2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (ℓ)
Reaction Type: Combustion
Enthalpy of Reaction: -3,119.66 kJ     (exothermic)
  [4ΔHf(CO2 (g)) + 6ΔHf(H2O (ℓ))] - [2ΔHf(C2H6 (g)) + 7ΔHf(O2 (g))]
  [4(-393.51) + 6(-285.83)] - [2(-84.68) + 7(0)] = -3119.66 kJ
Entropy Change: -619.27 J/K     (decrease in entropy)
  [4S°(CO2 (g)) + 6S°(H2O (ℓ))] - [2S°(C2H6 (g)) + 7S°(O2 (g))]
  [4(213.68) + 6(69.91)] - [2(229.12) + 7(205.03)] = -619.27 J/K
Reference(s): Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; p 224.

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