AP Study Questions
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1 Class: Date: AP Study Questions Multiple Choice Identify the choice that best completes the statement or answers the question. 3. The value of G at 25 C for the formation of POCl 3 from its constituent elements, P 2 (g) + O 2 (g) + 3Cl 2 (g) 2POCl 3 (g) a. -1,108.7 b. +1,108.7 c d e. -1, The value of H for the formation of calcium chloride from its constituent elements, Ca (s) + Cl 2 (g) CaCl 2 (s) a b c d e The value of H for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S (s, rhombic) + 3O 2 ( g) 2SO 3 (g) a b c d e The value of G at 25 C for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 2SO 3 (g) 2S (s, rhombic) + 3O 2 (g) a b c d e The value of G at 25 C for the formation of calcium chloride from its constituent elements, Ca (s) + Cl 2 (g) CaCl 2 (s) a b c d e The value of H for the formation of phosphorous trichloride from its constituent elements, is kj/mol a b c d e
2 7. The value of G at 25 C for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, SO 2 (g) S (s, rhombic) + O 2 (g) a b c d e The value of G at 25 C for the decomposition of calcium chloride into its constituent elements, CaCl 2 (s) Ca (s) + Cl 2 (g) a b c d e The value of G at 25 C for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S (s,rhombic) + 3O 2 (g) 2SO 3 (g) a b c d e The value of G at 25 C for the formation of phosphorous trichloride from its constituent elements, 11. The value of H for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, SO 2 (g) S (s,rhombic) + O 2 (g) a b c d e The value of H for the formation of POCl 3 from its constituent elements, P 2 (g) + O 2 (g) + 3Cl 2 (g) 2POCl 3 (g) a b c d e The equilibrium constant for a reaction is 0.48 at 25 C. What is the value of G (kj/mol) at this temperature? a. 1.8 b c d. 4.2 e. More information is needed. 14. The equilibrium constant for the following reaction is at 25 C. The value of G for this reaction is kj/mol. a. 22 b c. -25 d. -50 e. -22 a b c d e
3 15. Consider the reaction: FeO (s) + Fe (s) + O 2 (g) Fe 2 O 3 (s) Given the following table of thermodynamic data at 298 K: The value K for the reaction at 25 C is a. 370 b c d e Phosphorous and chlorine gases combine to produce phosphorous trichloride: 18. For the reaction C 2 H 6 (g) C 2 H 4 (g) + H 2 (g) H is +137 kj/mol and S is +120 J/K mol. This reaction is a. spontaneous at all temperatures b. spontaneous only at high temperature c. spontaneous only at low temperature d. nonspontaneous at all temperatures 19. For a given reaction, H = kj/mol and S = J/K-mol. The reaction will have G = 0 at K. Assume that H and S do not vary with temperature. a. 359 b c. 298 d e The equilibrium position corresponds to which letter on the graph of G vs f (course of reaction) below? G at 298 K for this reaction is kj/mol. The value of G at 298 K for a reaction mixture that consists of 1.5 atm P 2, 1.6 atm Cl 2, and 0.65 atm PCl 3 is a b c d e Given the following table of thermodynamic data, a. A b. B c. C d. D e. E 21. For the reaction C(s) + H 2 O(g) CO(g) + H 2 (g) complete the following sentence. The vaporization of TiCl 4 is a. spontaneous at all temperatures b. spontaneous at low temperature and nonspontaneous at high temperature c. nonspontaneous at low temperature and spontaneous at high temperature d. nonspontaneous at all temperatures e. not enough information given to draw a conclusion H = kj/mol and S = J/K mol at 298 K. At temperatures greater than C this reaction is spontaneous under standard conditions. a. 273 b. 325 c. 552 d. 710 e
4 22. Consider the reaction: NH 3 (g) + HCl (g) NH 4 Cl (s) Given the following table of thermodynamic data, determine the temperature (in C) above which the reaction is nonspontaneous. a. This reaction is spontaneous at all temperatures. b c d e Consider the reaction: FeO (s) + Fe (s) + O 2 (g) Fe 2 O 3 (s) Given the following table of thermodynamic data, 25. In the Haber process, ammonia is synthesized from nitrogen and hydrogen: N 2 (g) + 3H 2 (g) 2NH 3 (g) G at 298 K for this reaction is kj/mol. The value of G at 298 K for a reaction mixture that consists of 1.9 atm N 2, 1.6 atm H 2, and 0.65 atm NH 3 is a b c d e The standard Gibbs free energy of formation of is zero. (a) H 2 O (l) (b) Na (s) (c) H 2 (g) a. (a) only b. (b) only c. (c) only d. (b) and (c) e. (a), (b), and (c) 27. Consider the reaction: Ag + (aq) + Cl - (aq) AgCl (s) determine the temperature (in C) above which the reaction is nonspontaneous. a. This reaction is spontaneous at all temperatures. b c d e With thermodynamics, one cannot determine a. the speed of a reaction b. the direction of a spontaneous reaction c. the extent of a reaction d. the value of the equilibrium constant e. the temperature at which a reaction will be spontaneous Given the following table of thermodynamic data at 298 K: The value of K for the reaction at 25 C is a. 810 b c d e The standard Gibbs free energy of formation of is zero. (a) H 2 O (l) (b) O (g) (c) H 2 (g) a. (a) only b. (b) only c. (c) only d. (b) and (c) e. (a), (b), and (c) 4
5 AP Study Questions Answer Section MULTIPLE CHOICE 1. ANS: B PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 4 REF: Sec ANS: A PTS: 1 DIF: 4 REF: Sec ANS: D PTS: 1 DIF: 3 REF: Sec ANS: E PTS: 1 DIF: 4 REF: Sec ANS: C PTS: 1 DIF: 3 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: C PTS: 1 DIF: 4 REF: Sec ANS: E PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 4 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: E PTS: 1 DIF: 5 REF: Sec ANS: C PTS: 1 DIF: 3 REF: Sec ANS: B PTS: 1 DIF: 4 REF: Sec ANS: A PTS: 1 DIF: 4 REF: Sec ANS: C PTS: 1 DIF: 3 REF: Sec ANS: D PTS: 1 DIF: 2 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: A PTS: 1 DIF: 4 REF: Sec ANS: E PTS: 1 DIF: 5 REF: Sec ANS: D PTS: 1 DIF: 2 REF: Sec ANS: B PTS: 1 DIF: 4 REF: Sec ANS: C PTS: 1 DIF: 3 REF: Sec
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