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)
  [4ΔSf(CO2 (g)) + 6ΔSf(H2O (ℓ))] - [2ΔSf(C2H6 (g)) + 7ΔSf(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.

Back to list of reactions