Use the table below to answer the questions that follow. Thermodynamic Quantitie

Question

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) Substance H°f (kJ/mol) G°f (kJ/mol) S (J/K-mol) Carbon C (s, diamond) 1.88 2.84 2.43 C (s, graphite) 0 0 5.69 C2H2 (g) 226.7 209.2 200.8 C2H4 (g) 52.30 68.11 219.4 C2H6 (g) -84.68 -32.89 229.5 CO (g) -110.5 -137.2 197.9 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 The value of S° for the combustion of ethane to carbon dioxide and water vapor, 2C2H6 (g) + 7 O2 (g) 4CO2 (g) + 6H2O (g) is __________ J/K mol. The value of H for this reaction is__________ kJ/mol.

Explanation / Answer

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

DHrxn = (6*-241.826 + 4*-393.51) - (7*0+2*-84.7) = -2855.6 kj

DSrxn = (6*188.7 + 4*213.6) - (7*205 + 2*229.5) = 92.6 j/mol.k

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