32. What is the equilibrium expression for the decomposition of ammonium carbamate, NH4CO2NH2, that occurs according to this equation: NH4CO2NH2(s) <===> 2 NH3(g) + CO2(g) (A) K = [NH3][CO2] (B) K = [NH3]2[CO2] (C) K = [NH3][CO2] / [NH4CO2NH2]
(D) K = [NH3]2[CO2] / [NH4CO2NH2] 33. Which factors will affect both the position of equilibrium and the value of the equilibrium constant for this reaction? The [delta]H = - 92 kJ N2(g) + 3 H2(g) <===> 2 NH3(g) 34. According to the Brønsted-Lowry definition, a base is a substance that 35. What is the pH of a 0.02 M solution of KOH? 36. Which couple is not a conjugate acid-base pair? (A) HCO3¯ and CO32¯ (B) H3O+and H2O (C) H2PO4¯ and PO43¯ (D) NH3and NH2¯ 37. These acids are listed in order of decreasing acid strength in water. HI > HNO2> CH3COOH > HCN According to the Brønsted-Lowry theory, which anion is the weakest base? 38. What is the [H + ] in a 0.40 M solution of HOCl?
Substance Equilibrium Constant, KaHOCl 3.5 x 10¯8 39. Which of these salts will give a basic solution when added to water? 40. BaSO4and BaCO3are slightly soluble salts with comparable Kspvalues in water. Which salt(s) will be more in a 1.0 M solution of HNO3than in water? (A) BaSO4only (B) BaCO3only (C) both BaSO4and BaCO3(D) neither BaSO4or BaCO3 41. Which change represents a reduction process? 42. When these species (SO2, PbS, and Na2S2O3) are listed in order of increasing oxidation number of the sulfur atoms (most negative to most positive oxidation number), the correct order is 43. Use these reduction potentials to determine which one of the reactions below is spontaneous. Reaction Reduction Potentials, E°
Ag++ e¯ ---> Ag 0.800 V Pb2++ 2e¯ ---> Pb - 0.126 V V2++ 2e¯ ---> V - 1.18 V
- Spring '08
- Atom, Chemical reaction, Ion, Oxide