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Unformatted text preview: Chapter 15 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 1) The value of K eq for the equilibrium H 2 (g) + I 2 (g) 2 HI (g) is 794 at 25 °C. What is the value of K eq for the equilibrium below? 1/2 H 2 (g) + 1/2 I 2 (g) HI (g) A) 1588 B) 0.035 C) 28 D) 397 E) 0.0013 1) 2) The value of K eq for the equilibrium H 2 (g) + I 2 (g) 2 HI (g) is 794 at 25 °C. At this temperature, what is the value of K eq for the equilibrium below? HI (g) 1/2 H 2 (g) + 1/2 I 2 (g) A) 0.0013 B) 28 C) 0.035 D) 397 E) 1588 2) 3) The value of K eq for the equilibrium H 2 (g) + I 2 (g) 2 HI (g) is 54.0 at 427 °C. What is the value of K eq for the equilibrium below? HI (g) 1/2 H 2 (g) + 1/2 I 2 (g) A) 27 B) 0.136 C) 2.92 × 10 3 D) 7.35 E) 3.43 × 10 4 3) 1 4) Consider the following chemical reaction: H 2 (g) + I 2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H 2 , I 2 , and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. The value of K eq for this reaction is __________. A) 61 B) 9.0 × 10 3 C) 23 D) 111 E) 6.1 4) 5) A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular hydrogen and iodine: 2HI (g) H 2 (g) + I 2 (g) When the system comes to equilibrium at 425 °C, P HI = 0.708 atm, and P H 2 = P I 2 = 0.0960 atm. The value of K p at this temperature is __________. A) 6.80 × 10 2 B) 1.84 × 10 2 C) K p cannot be calculated for this gas reaction when the volume of the reaction vessel is not given. D) 1.30 × 10 2 E) 54.3 5) 6) Acetic acid is a weak acid that dissociates into the acetate ion and a proton in aqueous solution: HC 2 H 3 O 2 (aq) C 2 H 3 O 2 (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 ] = 0.0990 M, [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 __________. A) 5.71 × 10 4 B) 1.79 × 10 5 C) 1.75 × 10 7 D) 0.100 E) 5.71 × 10 6 6) 2 7) At elevated temperatures, molecular hydrogen and molecular bromine react to partially form hydrogen bromide: H 2 (g) + Br 2 (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) 0.440 B) 0.324 C) 0.000 D) 0.566 E) 0.232 7) 8) Dinitrogentetraoxide partially decomposes according to the following equilibrium: N 2 O 4 (g) 2NO 2 (g) A 1.00 L flask is charged with 0.400 mol of N 2 O 4 . At equilibrium at 373 K, 0.0055 mol of N 2 O 4 remains. K eq for this reaction is __________....
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This note was uploaded on 04/25/2010 for the course CHEM 204 taught by Professor Prof.k during the Spring '10 term at Bradley.
 Spring '10
 Prof.K
 Equilibrium

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