Exam2_Solutions

# 1 hso 3 and h 2 o 2 some other pair 3 so 2 3 and h 3

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1. HSO 3 and H 2 O 2. some other pair 3. SO 2 3 and H 3 O + 4. H 3 O + and H 2 O 5. HSO 3 and H 3 O + correct Explanation: 013 10.0 points In this question K means K p . Consider the reaction Ni(s) + 4 CO(g) Ni(CO) 4 (g) at a certain temperature. Calculate K for this reaction if, at equilibrium, the partial pressures of CO(g) and Ni(CO) 4 (g) are 1.25 atm and 6.65 atm over 1.00 kg of nickel. 1. 2.2 2. 1.02 3. 1.75 4. 2.72 correct 5. 3.4 Explanation: 014 10.0 points Consider the reaction A + B C + D K c = 22 . 376 . What is the K c value for the reaction 2 A + 2 B 2 C + 2 D ? 1. 44 . 752 2. 22 . 376 3. 0 4. 0 . 0447 5. 501 correct Explanation: 015 10.0 points The equilibrium constant K c for the reaction 2 NOCl(g) 2 NO(g) + Cl 2 (g) is 0.51 at a certain temperature. A mixture of NOCl, NO, and Cl 2 with concentrations 1.3, 1.2, and 0.60 M, respectively, was introduced into a container at this temperature. Which of the following is true? 1. [Cl 2 ] = 0.30 M at equilibrium. 2. NOCl(g) is produced until equilibrium is reached. 3. [NOCl] = [NO] = [Cl 2 ] at equilibrium. 4. No apparent reaction takes place. cor- rect 5. Cl 2 (g) is produced until equilibrium is reached. Explanation: 016 10.0 points

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Version 129 – Exam 2 – Sutcliffe – (52410) 5 Aqueous ammonia (approx 28% by weight) is 15.0 M and has a density of 0.90 g/mL. Calculate the molality of ammonia in this solution. 1. 42.6 m 2. 23.3 m correct 3. 37.3 m 4. 15.4 m 5. 49.1 m Explanation: 017 10.0 points Which of the following equilibrium reactions is NOT affected by changes in pressure? 1. H 2 (g) + Br 2 ( ) 2 HBr(g) 2. 2 H 2 O 2 ( ) 2 H 2 O( ) + O 2 (g) 3. 2 BrCl(g) Br 2 (g) + Cl 2 (g) correct 4. H 2 (g) + I 2 (s) 2 HI(g) 5. 2 CO 2 (g) 2 CO(g) + O 2 (g) Explanation: 018 10.0 points K c = 9 . 7 at 900 K for the reaction NH 3 (g) + H 2 S(g) NH 4 HS(s) If the initial concentrations of NH 3 (g) and H 2 S(g) are 2.0 M, what is the equilibrium concentration of H 2 S(g)? 1. 0.32 M correct 2. 0.10 M 3. 1.7 M 4. 1.9 M 5. 0.20 M Explanation: Note that because the product is a solid that K = 1 [NH 3 ][H 2 S] = 9 . 7 019 10.0 points Which of the following is NOT a colligative property for a solution? 1. depressing the freezing point of the sol- vent 2. lowering the vapor pressure of the solvent 3. molecular weight of the solute correct 4. osmotic pressure of the solvent 5. elevating the boiling point of the solvent Explanation: Colligative properties are properties of so- lutions that depend on the number of solute particles and not the kind of particles. Molec- ular weight depends on the type of particles you have, not how many. 020 10.0 points Which of the following a) H 2 CO 3 b) HCl c) HNO 2 d) HClO 4 are strong acid(s)? 1. Another acid or another combination of acids 2. d 3. b; c; d 4. a; c 5. b; d correct Explanation: HCl (hydrochloric acid) and HClO 4 (per- chloric acid) are strong acids since they disso- ciate completely in water. H 2 CO 3 (carbonic acid) and HNO 2 (nitrous acid) are weak acids since they do not dissociate completely.
Version 129 – Exam 2 – Sutcliffe – (52410) 6 021 10.0 points In this question K means K p .

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