e5_132_f09 - Final Exam, CHE 132 Fall 2009 Multiple Choice...

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Final Exam, CHE 132 Fall 2009 Multiple Choice On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. Which one of the following is the systematic name of the compound [Co(NH 3 ) 4 Br 2 ]Cl ? a. Tetraamminedibromocobalt(II) chloride b. Chlorotetraamminedibromocobaltate(II) c. Dibromotetraamminecobalt(III) chloride d. Tetraamminechlorocobalt(II) bromide e. Tetraamminedibromocobalt(III) chloride ____ 2. At 25.0 °C the standard entropy change for the reaction CO(g) + H 2 (g) CO 2 (g) + H 2 (g) is 41.8 J K –1 mol –1 . The equilibrium constant for the reaction at that temperature is K = 1.00 × 10 –5 . What is the standard enthalpy of the reaction at 25.0 °C? R = 8.314 J K –1 mol –1 . a. –13.3 kJ mol –1 b. +12.5 kJ mol –1 c. +16.1 kJ mol –1 d. +28.5 kJ mol –1 e. +41.0 kJ mol –1 ____ 3. What is the oxidation state of the transition metal ion in the complex [Co(en) 2 (NH 3 )CN]Cl 2 ? a. Co(IV) b. Co(III) c. Co(II) d. Co(I) e. Co(0)
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____ 4. After we mix 25.0 mL of a 0.20 mol L –1 NaCl aqueous solution with 40.0 mL of a 0.10 mol L –1 HCl aqueous solution, what is the pH of the resulting solution? Assume volume additivity. a. 0.14 b. 1.21 c. 0.79 d. 7.00 e. 1.00 ____ 5. The ionization constant of HCO 2 H, formic acid, HCO 2 H + H 2 O HCO 2 + H 3 O + is K a = 1.8 × 10 –4 at 25 °C in water. What is the pH of an aqueous solution that is 0.20 mol/L in HCO 2 H? a. 2.2 b. 1.9 c. 4.8 d. 12.1 e. To answer we need to know the ionization constant of the conjugate base. ____ 6. At 25 °C the half life of a certain first order reaction is t 1/2 = 248 s. What is the value of the rate constant of the reaction at this temperature? a. 2.79 × 10 –3 s –1 b. –4.82 s –1 c. 358 s d. 172 s e. 2.79 × 10 3 s –1
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____ 7. To buffer a solution at pH = 4.57, what number of moles of sodium acetate, NaAcO, should you add to 500.0 mL of 0.150 mol L –1 solution of acetic acid? Assume that the volume of the solution does not change by the addition of the (solid) salt. p K a (HAcO) = 4.74. a. 0.100 mol b. 0.333 mol c. 0.125 mol d. 0.050 mol e. 0.075 mol ____ 8. During a process the volume of a system increases from 3.20 dm 3 to 3.40 dm 3 against a constant external pressure of 3.60 bar. Calculate the work involved in the process. 1 bar = 10 5 N m –2 ; 1 J = 1 N m a. +72.0 J b. –0.72 J c. –3.60 kJ d. –72.0 J e. +3.60 kJ
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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e5_132_f09 - Final Exam, CHE 132 Fall 2009 Multiple Choice...

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