Thermodynamics Quantities for Selected Substances at 298.15 K (25⁰C) Substance ∆H⁰f (kJ/mol) ∆G⁰f (kJ/mol) S (J/K-mol) Carbon       C2H2(g) 226.7 209.2 200.8 CO2(g) -393.5 -394.4 213.6         Hydrogen       H2(g) 0 0 130.58         Oxygen       O2(g) 0 0 205.0 H2O(l) -285.83 -237.13 69.91 6. What is the ∆S⁰ of the combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2C­2H­2(g) + 5O2(g) → 4CO2(g) + 2H2O(l) in J/K?

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Thermodynamics Quantities for Selected Substances at 298.15 K (25⁰C)

Substance

∆H⁰f (kJ/mol)

∆G⁰f (kJ/mol)

S (J/K-mol)

Carbon

     

C2H2(g)

226.7

209.2

200.8

CO2(g)

-393.5

-394.4

213.6

       

Hydrogen

     

H2(g)

0

0

130.58

       

Oxygen

     

O2(g)

0

0

205.0

H2O(l)

-285.83

-237.13

69.91

6. What is the ∆S⁰ of the combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2C­22(g) + 5O2(g) → 4CO2(g) + 2H2O(l) in J/K?

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