Fall 2011 Chem 162 lecture 20 clarity Thermo HOME

Fall 2011 Chem 162 lecture 20 clarity Thermo HOME - Lecture...

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G Hall 1 Lecture 21 Some Thermodynamics clarifications Thursday November 17, 2011
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2 Method 1 Determine the free energy change in the following reaction at 298 K: 2 H 2 O(g) + O 2 (g) 2 H 2 O 2 (g). Substance G ° , kJ/mol H 2 O 2 ( g ) −105.6 O 2 ( g ) 0 H 2 O( g ) 228.6 G Hall
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3 Practice— Determine the free energy change in the following reaction at 298 K: 2 H 2 O(g) + O 2 (g) 2 H 2 O 2 (g). standard free energies of formation from Appendix IIB G ° (kJ) Solution: Conceptual Plan: Relationships: Given: Find: G ° G ° f of prod and react G Hall
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4 Method 2 Determine the free energy change in the following reaction at 298 K: 2 H 2 O(g) + O 2 (g) 2 H 2 O 2 (g). Substance H ° , kJ/mol S ° , J/mol H 2 O 2 ( g ) −136.3 232.7 O 2 ( g ) 0 205.2 H 2 O( g ) −2 41.8 188.8 G Hall
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5 Practice—Determine the free energy change in the following reaction at 298 K: 2 H 2 O(g) + O 2 (g) 2 H 2 O 2 (g). standard energies from Appendix IIB, T = 298 K G ° (kJ) Solution: Conceptual Plan: Relationships: Given: Find: G ° H ° f H ° , S º H ° = 211.0 kJ, S ° = 117.4 J/K, T = 298 K G ° (kJ) G Hall
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Methods comparison Method 1: Use the tabulated
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Fall 2011 Chem 162 lecture 20 clarity Thermo HOME - Lecture...

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