chem ch 19 - Chemistry 11e(Brown/LeMay/Brusten/Murphy...

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Chemistry, 11e (Brown/LeMay/Brusten/Murphy) Chapter 19: Chemical Thermodynamics 19.1 Multiple-Choice and Bimodal Questions Use the table below to answer the questions that follow. 1) The value of S ∆ ° for the catalytic hydrogenation of acetylene to ethene, 2 2 2 2 4 C H (g) H (g) C H (g) + is __________ J/K∙ mol. A) +18.6 B) +550.8 C) +112.0 D) -112.0 E) -18.6 Answer: D Diff: 3 Page Ref: Sec. 19.4
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Chemistry, 11e (Brown/LeMay/Brusten/Murphy) Chapter 19: Chemical Thermodynamics 2) The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2 2 2 2 2 2C H (g) 5O 4CO (g) 2H O(l) + + The value of S ∆ ° for this reaction is __________ J/K∙ mol. 3) The value of S ∆ ° for the reaction 2 2C(s,diamond) O (g) 2CO(g) + is __________ J/K∙ mol.
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4) The value of S ∆ ° for the catalytic hydrogenation of ethene to ethane, 2 4 2 2 6 C H (g) H (g) C H (g) + is __________ J/K∙ mol. 5) The value of S ∆ ° for the catalytic hydrogenation of acetylene to ethane 2 2 2 2 6 C H (g) 2H (g) C H (g) + is __________ J/K∙ mol. A) -76.0 B) +440.9 C) -232.5 D) +232.5 E) +28.7 Answer: C Diff: 3 Page Ref: Sec. 19.4
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Chemistry, 11e (Brown/LeMay/Brusten/Murphy) Chapter 19: Chemical Thermodynamics 6) The value of S ∆ ° for the oxidation of carbon to carbon monoxide, 2 2C(s,graphite) O (g) 2CO(g) + is __________ J/K∙ mol. Carbon monoxide is produced in the combustion of carbon with limited oxygen. 7) The value of S ∆ ° for the oxidation of carbon to carbon dioxide, 2 2 C(s,graphite) O (g) CO (g) + is __________ J/K∙ mol. The combustion of carbon, as in charcoal briquettes, in the presence of abundant oxygen produces carbon dioxide.
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8) The combustion of ethene in the presence of excess oxygen yields carbon dioxide and water: 2 4 2 2 2 C H (g) 3O (g) 2CO (g) 2H O(l) + + The value of ΔS° for this reaction is __________ J/K∙ mol. 9) The combustion of ethane in the presence of excess oxygen yields carbon dioxide and water: 2 6 2 2 2 2C H (g) 7O (g) 4CO (g) 6H O(l) + + The value of S ∆ ° for this reaction is __________ J/K∙ mol. A) +718.0 B) -620.1 C) -718.0 D) -151.0 E) +151.0 Answer: B Diff: 3 Page Ref: Sec. 19.4
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Chemistry, 11e (Brown/LeMay/Brusten/Murphy) Chapter 19: Chemical Thermodynamics
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