exam3fall2011f4

exam3fall2011f4 - GeneralChemistryII R.LopezdelaVega Name...

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Third Examination Fall 2011 General Chemistry II R. Lopez de la Vega Name___________________________________ Bubble in the form number in the section entitled Grade or Educ in the scantron. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following is NOT true for Δ G rxn ? A) If Δ rxn > 0, the reaction is spontaneous in the reverse direction. B) If Δ rxn > 0, the reaction is spontaneous in the forward direction. C) If Q = 1, then Δ G rxn = Δ rxn . D) If Δ rxn = 0, the reaction is spontaneous in the reverse direction. E) Under equilibrium conditions, Δ G rxn = 0. 1) 2) What is the pH of a solution made by mixing 40.00 mL of 0.100 M HCl with 25.00 mL of 0.100 M KOH? Assume that the volumes of the solutions are additive. 2) 3) Use the free energies of formation given below to calculate the equilibrium constant (K) for the following reaction at 298 K. 2 HNO 3 (aq) + NO(g) 3 NO 2 (g) + H 2 O(l) Κ = ? Δ f (kJ/mol) - 110.9 87.6 51.3 - 237.1 3) 4) A 100.0 mL sample of 0.10 M NH 3 is titrated with 0.10 M HNO 3 . Determine the pH of the solution after the addition of 100.0 mL of HNO 3 . The K b of NH 3 is 1.8 × 10 - 5 . 4) 5) When titrating a monoprotic strong acid with a weak base at 25°C, the A) pH will be less than 7 at the equivalence point. B) pH will be greater than 7 at the equivalence point. C) titration will require more moles of the base than acid to reach the equivalence point. D) pH will be 7 at the equivalence point. E) titration will require more moles of acid than base to reach the equivalence point. 5) D 1
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