Chapter 15 - Chemistry 11e(Brown/LeMay/Bursten/Murphy...

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Chemistry, 11e(Brown/LeMay/Bursten/Murphy) Chapter 15 Chemical Equilibrium 15.1 Multiple-Choice and Bimodal Questions 1) The value of K eq for the equilibrium 2 2 H (g) I (g) 2 HI (g) + is 794 at 25 °C. What is the value of K eq for the equilibrium below? 2 2 1/ 2H (g) 1/ 2I (g) HI (g) + A) 397 B) 0.035 C) 28 D) 1588 E) 0.0013 Answer: C Diff: 3 Page Ref: Sec. 15.3 2) The value of K eq for the equilibrium 2 2 H (g) I (g) 2 HI (g) + is 794 at 25 °C. At this temperature, what is the value of K eq for the equilibrium below? 2 2 HI (g) 1/ 2H (g) 1/ 2I (g) +
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3) The value of K eq for the equilibrium 2 2 H (g) I (g) 2 HI (g) + is 54.0 at 427 °C. What is the value of K eq for the equilibrium below? 2 2 HI (g) 1/ 2H (g) 1/ 2I (g) + 4) Consider the following chemical reaction: 2 2 H (g) I (g) 2 HI (g) + At equilibrium in a particular experiment, the concentrations of H 2 , I 2 , and HI were 0.15M 0.033M and 0.55M respectively. The value of K eq for this reaction is __________.
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5) A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular hydrogen and iodine: 2 2 2HI (g) H (g) I (g) + When the system comes to equilibrium at 425 °C, P HI = 0.708atm , and PH 2 = PI 2 = 0.0960 atm. The value of K p at this temperature is __________. A) 6.80 × 10 - 2 B) 1.30 × 10 - 2 C) K p cannot be calculated for this gas reaction when the volume of the reaction vessel is not given. D) 54.3 E) 1.84 × 10 - 2 Answer: E Diff: 3 Page Ref: Sec. 15.5 6) Acetic acid is a weak acid that dissociates into the acetate ion and a proton in aqueous + 2 2 3 2 2 3 HC H O (aq) C H O (aq) H (aq) - + At equilibrium at 25 °C a 0.100 M solution of acetic acid has the following concentrations: [HC 2 H 3 O 2 ] = 0.0990M [C 2 H 3 O 2 - ] = 1.33 × 10 - 3 M and H + = 1.33 × 10 - 3 M The equilibrium constant, K eq , for the ionization of acetic acid at 25 ° C is __________.
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7) At elevated temperatures, molecular hydrogen and molecular bromine react to partially form hydrogen bromide: 2 2 H (g) Br (g) 2HBr (g) + A mixture of 0.682 mol of H 2 and 0.440 mol of Br 2 is combined in a reaction vessel with a volume of 2.00 L. At equilibrium at 700 K, there are 0.566 mol of H 2 present. At equilibrium, there are __________ mol of Br 2 present in the reaction vessel. A) 0.000 B) 0.440 C) 0.566 D) 0.232 E) 0.324 Answer: E Diff: 2 Page Ref: Sec. 15.5
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