27. Calculate in a 0.40 M solution of NaH₂PO₄. (For H₃РО₄, , )
(A)
(B)
(C) 0.40 M
(D)
(E)

28. A mixture of hydrogen and chlorine remains unreacted until it is exposed to ultraviolet light from a burning magnesium strip. Then the following reaction occurs very rapidly. H2(g) + Cl2(g) → 2HCI(g) △G=-45.54 kJ △H=-44.12 kJ △S=-4.76 J/K  Select the statement below that best explains this behavior. (A) The reactants are thermodynamically more stable than the products. (B) The reaction has a small equilibrium constant. (C) The ultraviolet light raises the temperature ofthe system and makes the reaction more favorable. (D) The negative value forAS slows down the reaction. (E) The reaction is spontaneous, but the reactants are kinetically stable.

29. Consider the following reaction: 2HF(g) ⇌H2(g) + F2(g) (K= 1.00 x ) Given 1.22 mol of HF(g), 0.760 mol of H2(g), and 1.09 mol of F2(g) are mixed in a 4.00-L flask, determine the reaction quotient, Q, and the net direction to achieve equilibrium. (A) Q=0.679; the equilibrium shifts to the right. (B) Q=0.557; the equilibrium shifts to the left. (C) Q=0.679; the equilibrium shifts to the left. (D) Q=0.557; the equilibrium shifts to the right. (E) Q=1.43; the system is at equilibrium.

30. Which statement is true of a process in which 1 mol of a gas is expanded from state A to state B? (A) When the gas expands from state A to state B, the surroundings are doing work on the system. (B) he amount of work done in the process must be the same, regardless of the path. (C) It is not possible to have more than one path for a change of state. (D) The final volume of the gas will depend on the path taken. (E) The amount of heat released in the process will depend on the path taken.

31. An ethyl group that is attached to a substituent that does not contain a hydrogen atom appears as what in a NMR spectrum? (A) a triplet and a quartet with relative intensities of 3 and 2, respectively (B) a doublet and a triplet with relative intensities of 3 and 2, respectively (C) a triplet and a quartet with relative intensities of 2 and 3, respectively (D) a doublet and a triplet with relative intensities of 2 and 3, respectively (E) none of these

32. Which base-pair is most stable in Wason-Crick DNA Structure?  (A)(B)(C)(D)(E)

33. A 0.4987 g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.9267 g of CO2 and 0.1897g of H2O. What is the empirical formula of the compound? (A) CHO (B) C3H3O2 (C) C2H2O (D) C6H3O2 (E) C3H6O2

34. When a student performs an endothermic reaction in a calorimeter, how (if any) does the calculated value of AH differ from the actual value if the heat exchanged with the calorimeter is not taken into account? (A) is less positive because the reaction absorbs heat from the calorimeter. (B) is less negative because the calorimeter absorbs heat from the reaction. (C) is more positive because the reaction absorbs heat from the calorimeter. (D) is more negative because the calorimeter always absorbs heat from the reaction. (E) equals the actual value because the calorimeter does not absorb heat. :

35. Choose the most likely pattern for the crystal field diagram for the complex trans- where produces a much stronger crystal field than does NH3. (A)(B)(C)(D) (E)

36. What monomer(s) is(are) needed to make the polymer shown here? I. HOCH2CH2OH II. HOOCCH2CH2COOH III. HOCH2CH2COОН IV. HOCH = CHОН V. HOOCCH = CHCOOН (A) II only (B) III only (C) I and II (D) IV and V (E) II and III

37. Consider the galvanic cell shown below (the contents of each half-cell are written beneath each compartment). The standard reduction potentials are as follows: What is the value of E for this cell at 25°C? (A) 2.21 V (B) 1.76 V (C) 2.12 V (D) 1.88 V (E) 0.59 V

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