2) The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water:
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1 Chapter 19 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at K (25 C) Substance ΔH f (kj/mol) ΔG f (kj/mol) S (J/K-mol) Carbon C (s, diamond) C (s, graphite) C2H2 (g) C2H4 (g) C2H4 (g) CO (g) CO2 (g) Hydrogen H2( g) Oxygen O2 (g) H2O (l) ) The value of ΔS for the catalytic hydrogenation of acetylene to ethene, 1) C2H2 (g) + H2 (g) C2H4 (g) A) B) C) D) E) ) The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2) 2C2H2 (g) + 5O2 (g) 4CO2 (g) + 2H2O (l) The value of ΔSo for this reaction A) B) C) D) E)
2 3) The value of ΔS for the reaction 3) 2C (s, diamond) + O2 (g) 2CO (g) A) B) C) D) +9.5 E) ) The value of ΔS for the catalytic hydrogenation of ethene to ethane, 4) C2H4 (g) + H2(g) C2H6 (g) A) B) C) D) E) ) The value of ΔS for the catalytic hydrogenation of acetylene to ethane, 5) C2H2 (g) + 2H2 (g) C2H6 (g) A) B) C) D) E) ) The value of ΔS for the oxidation of carbon to carbon monoxide, 6) 2C (s, graphite) + O2 (g) 2CO (g) Carbon monoxide is produced in the combustion of carbon with limited oxygen. A) B) C) D) E) ) The value of ΔS for the oxidation of carbon to carbon dioxide, 7) C (s, graphite) + O2 (g) CO2(g) The combustion of carbon, as in charcoal briquettes, in the presence of abundant oxygen produces carbon dioxide. A) B) +2.9 C) D) -2.9 E) ) The combustion of ethene in the presence of excess oxygen yields carbon dioxide and water: 8) C2H4 (g) + 3O2 (g) 2CO2 (g) + 2H2O (l) The value of ΔSo for this reaction A) B) C) D) E)
3 9) The combustion of ethane in the presence of excess oxygen yields carbon dioxide and water: 9) 2C2H6 (g) + 7O2 (g) 4CO2 (g) + 6H2O (l) The value of ΔSo for this reaction A) B) C) D) E) ) The combustion of hydrogen in the presence of excess oxygen yields water: 10) 2H2(g) + O2(g) 2H2O (l) The value of ΔSo for this reaction A) B) C) D) E)
4 Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at K (25 C) Substance ΔH f (kj/mol) ΔG f (kj/mol) S (J/K-mol) Calcium Ca (s) CaCl2 (s) Ca2 + (aq) Chlorine Cl2 (g) Cl- (aq) Oxygen O2 (g) H2O (l) Phosphorus P2 (g) PCl3 (g) POCl3 (g) Sulfur S (s, rhombic) SO2(g) SO3(g) ) The value of ΔS for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 11) 2S (s, rhombic) + 3O2(g) 2SO3 (g) A) B) C) D) E) ) The value of ΔS for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, 12) S (s, rhombic) + O2(g) SO2(g) A) B) C) D) E)
5 13) The value of ΔS for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 13) 2SO3 (g) 2S (s, rhombic) + 3O2 (g) A) B) C) D) E) ) The value of ΔS for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, 14) SO2 (g) S (s, rhombic) + O2 (g) A) B) C) D) E) ) The value of ΔS for the formation of POCl3 from its constituent elements, 15) P2 (g) + O2 (g) + 3Cl2 (g) 2POCl3 (g) A) +771 B) +321 C) -771 D) -442 E) ) The value of ΔS for the decomposition of POCl3 into its constituent elements, 16) 2POCl3 (g) P2 (g) + O2 (g) + 3Cl2 (g) A) +321 B) +771 C) +442 D) -771 E) ) The value of ΔS for the formation of phosphorous trichloride from its constituent elements, 17) P2 (g) + 3Cl2 (g) 2PCl3 (g) A) B) C) D) E) ) The value of ΔS for the decomposition of phosphorous trichloride into its constituent elements, 18) 2PCl3 (g) P2 (g) + 3Cl2( g) A) B) C) D) E)
6 19) The value of ΔS for the formation of calcium chloride from its constituent elements, 19) Ca (s) + Cl2 (g) CaCl2 (s) A) B) C) D) E) ) The value of ΔS for the decomposition of calcium chloride into its constituent elements, 20) CaCl2 (s) Ca (s) + Cl2 (g) A) B) C) D) E) ) The value of ΔH for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 21) 2S (s, rhombic) + 3O2( g) 2SO3 (g) A) B) C) D) E) ) The value of ΔH for the decomposition of gaseous sulfur trioxide to its component elements, 22) 2SO3 (g) 2S (s, rhombic) + 3O2 (g) A) B) C) D) E) ) The value of ΔH for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, 23) S (s, rhombic) + O2 (g) SO2 (g) A) B) C) D) E) ) The value of ΔH for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, 24) SO2 (g) S (s,rhombic) + O2 (g) A) B) +0.0 C) D) E)
7 25) The value of ΔH for the formation of POCl3 from its constituent elements, 25) P2 (g) + O2 (g) + 3Cl2 (g) 2POCl3 (g) A) B) C) D) E) ) The value of ΔH for the decomposition of POCl3 into its constituent elements, 26) 2POCl3 (g) P2 (g) + O2 (g) + 3Cl2 (g) A) B) -1,228.7 C) D) +1,228.7 E) ) The value of ΔH for the formation of phosphorous trichloride from its constituent elements, 27) P2 (g) + 3Cl2 (g) 2PCl3 (g) is kj/mol A) B) C) D) E) ) The value of ΔH for the decomposition of phosphorous trichloride into its constituent elements, 28) 2PCl3 (g) P2 (g) + 3Cl2 (g) A) B) C) D) E) ) The value of ΔH for the formation of calcium chloride from its constituent elements, 29) Ca (s) + Cl2 (g) CaCl2 (s) A) B) C) D) E) ) The value of ΔH for the decomposition of calcium chloride into its constituent elements, 30) CaCl2 (s) Ca (s) + Cl2 (g) A) B) C) D) E)
8 31) The value of ΔG at 25 C for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 31) 2S (s,rhombic) + 3O2 (g) 2SO3 (g) A) B) C) D) E) ) The value of ΔG at 25 C for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, 32) S (s, rhombic) + O2(g) SO2 (g) A) B) C) D) E) ) The value of ΔG at 25 oc for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 33) 2SO3 (g) 2S (s, rhombic) + 3O2 (g) A) B) C) D) E) ) The value of ΔG at 25 C for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, 34) SO2 (g) S (s, rhombic) + O2 (g) A) B) C) D) E) ) The value of ΔG at 25 C for the formation of POCl3 from its constituent elements, 35) P2 (g) + O2 (g) + 3Cl2 (g) 2POCl3 (g) A) B) C) +1,109 D) -1,005 E) -1,109 36) The value of ΔG at 25 C for the decomposition of POCl3 into its constituent elements, 36) 2POCl3 (g) P2 (g) + O2 (g) + 3Cl2 (g) A) B) +1,109 C) -1,005 D) E) -1,109 8
9 37) The value of ΔG at 25 C for the formation of phosphorous trichloride from its constituent elements, 37) P2 (g) + 3Cl2 (g) 2PCl3 (g) A) B) C) D) E) ) The value of ΔG at 25 C for the decomposition of phosphorous trichloride into its constituent elements, 38) 2PCl3 (g) P2 (g) + 3Cl2 (g) A) B) C) D) E) ) The value of ΔG at 25 C for the formation of calcium chloride from its constituent elements, 39) Ca (s) + Cl2 (g) CaCl2 (s) A) B) C) D) E) ) The value of ΔG at 25 C for the decomposition of calcium chloride into its constituent elements, 40) CaCl2 (s) Ca (s) + Cl2 (g) A) B) C) D) E) ) The value of ΔG at 373 K for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, 41) S (s, rhombic) + O2 (g) SO2 (g) At 298K, ΔH for this reaction is kj/mol, and ΔS is J/K. A) B) C) -4,597 D) E) +4,597 9
10 Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at K (25 C) Substance ΔH f (kj/mol) ΔG f (kj/mol) S (J/K-mol) Calcium Ca (s) CaCl2 (s) Ca2 + (aq) Chlorine Cl2 (g) Cl- (aq) Oxygen O2 (g) H2O (l) Phosphorus P2 (g) PCl3 (g) POCl3 (g) Sulfur S (s, rhombic) SO2(g) SO3(g) ) The value of ΔG at 373 K for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 42) 2S (s, rhombic) + 3O2 (g) 2SO3 (g) A) B) C) D) E)
11 43) Given the thermodynamic data in the table below, calculate the equilibrium constant for the reaction: 43) 2 SO2 (g) + O2 (g) 2 SO3 (g) Substance ΔHf (kj/mol) Δ (J/mol K) SO2 (g) O2 (g) SO3 (g) A) B) 1.06 C) 1.95 D) E) More data are needed. 44) The equilibrium constant for a reaction is 0.48 at 25 C. What is the value of ΔG (kj/mol) at this temperature? 44) A) -4.2 B) 4.2 C) D) 1.8 E) More information is needed. 45) The equilibrium constant for the following reaction is at 25 C. 45) N2 (g) + 3H2 (g) 2NH3 (g) The value of ΔG for this reaction A) -4.2 B) -22 C)22 D) -50 E)
12 46) Consider the reaction: 46) NH3 (g) + HCl (g) NH4Cl (s) Given the following table of thermodynamic data at 298 ok: Substance ΔHf (kj/mol) S ( J/K mol) NH3 (g) HCl (g) NH4Cl (s) The value of K for the reaction at 25 C is. A) B) 150 C) D) E) ) Consider the reaction: 47) FeO (s) + Fe (s) + O2 (g) Fe2O3 (s) Given the following table of thermodynamic data at 298 ok: Substance ΔHf (kj/mol) S ( J/K mol) FeO (s) Fe (s) O2 (g) Fe2O3 (s) The value K for the reaction at 25 C is. A) B) C)370 D) E)
13 48) Consider the reaction: 48) Ag+ (aq) + Cl- (aq) AgCl (s) Given the following table of thermodynamic data at 298 ok: Substance ΔHf (kj/mol) S (J/K mol) Ag+ (aq) Cl- (aq) AgCl(s) The value of K for the reaction at 25 C is. A) B) 810 C) D) E)
14 Answer Key Testname: CHAPTER 19 PRACTICE QUESTIONS 1) B 2) E 3) B 4) A 5) D 6) D 7) B 8) A 9) D 10) E 11) B 12) D 13) A 14) B 15) D 16) C 17) E 18) C 19) E 20) B 21) B 22) E 23) B 24) D 25) B 26) D 27) B 28) B 29) C 30) C 31) D 32) A 33) A 34) E 35) E 36) B 37) E 38) C 39) D 40) D 41) D 42) C 43) D 44) D 45) D 46) C 47) E 48) D 14
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