2 C2H6 (g ethane) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (ℓ)

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Reaction Type:

Combustion

Stoichiometry

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C2H6           Mass: g
O2             Mass: g  or Gas Volume: L
CO2            Mass: g  or Gas Volume: L
H2O            Mass: g

Enthalpy of Reaction

[4ΔHf(CO2 (g)) + 6ΔHf(H2O (ℓ))] - [2ΔHf(C2H6 (g ethane)) + 7ΔHf(O2 (g))]
[4(-393.51) + 6(-285.83)] - [2(-84.68) + 7(0)] = -3119.66 kJ
-3,119.66 kJ     (exothermic)

Entropy Change

[4ΔSf(CO2 (g)) + 6ΔSf(H2O (ℓ))] - [2ΔSf(C2H6 (g ethane)) + 7ΔSf(O2 (g))]
[4(213.68) + 6(69.91)] - [2(229.12) + 7(205.03)] = -619.27 J/K
-619.27 J/K     (decrease in entropy)

Reference(s):

Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; p 224.

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