Cu2S (s alpha) + 1 O2 (g) → 2 Cu (s) + SO2 (g)

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Reaction Type:

Single displacement/Oxidation-reduction

Stoichiometry

Enter a mass or volume in one of the boxes below. Upon hitting submit, the stoichiometric equivalents will be calculated for the remaining reactants and products. All gases are assumed to be at STP.

Cu2S           Mass: g
O2             Mass: g  or Gas Volume: L
Cu             Mass: g
SO2            Mass: g  or Gas Volume: L

Enthalpy of Reaction

[2ΔHf(Cu (s)) + 1ΔHf(SO2 (g))] - [1ΔHf(Cu2S (s alpha)) + 1ΔHf(O2 (g))]
[2(0) + 1(-296.83)] - [1(-79.5) + 1(0)] = -217.33 kJ
-217.33 kJ     (exothermic)

Entropy Change

[2ΔSf(Cu (s)) + 1ΔSf(SO2 (g))] - [1ΔSf(Cu2S (s alpha)) + 1ΔSf(O2 (g))]
[2(33.15) + 1(248.11)] - [1(120.92) + 1(205.03)] = -11.54 J/K
-11.54 J/K     (decrease in entropy)

Reference(s):

Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 386.
Kotz, John C., Treichel, Paul, and Weaver, Gabriela. Chemistry & Chemical Reactivity 6th ed.; Thomson Brooks/Cole: Belmont, CA, 2006; p 166.

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