85. Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O. Determine its empirical formula.
(A) HNO
(B) H₂NO₂
(C)
(D)
(E) H₂NO₃

81. Which of the following statements concerning a face-centered cubic unit cell and the corresponding lattice, made up of identical atoms, is incorrect? (A) The coordination number of the atoms in the lattice is 8. (B) The packing in this lattice is more efficient than for a body-centered cubic system. (C) If the atoms have radius r, then the length of the cube edge is (D) There are four atoms per unit cell in this type of packing. (E) The packing efficiency in this lattice and hexagonal close packing are the same.

82. Which of the followings will give a solution with a pH ＞ 7, but is not an Arrhenius base in the strict sense? (A) CH3NH2 (B) NaOH (C) CO2 (D) Ca(OH)2 (E) CH4

83. Pentane, , boils at 35°C. Which of the followings is true about kinetic energy, Ek, and potential energy, Ep, when liquid pentane at 35°C is compared with pentane vapor at 35°C? (A) Ek(g) ＜ Ek(l)； Ep(g) ≈ Ep(l) (B) Ek(g) ＞ Ek(l)； Ep(g) ≈ Ep(l) (C) Ep(g) ＜ Ep(l)； Ek(g) ≈ Ek(l) (D) Ep(g) ＞ Ep(l)； Ek(g) ≈ Ek(l) (E) Ep(g) ≈ Ep(l)； Ek(g) ≈ Ek(l)

84. Five molecules are shown as below. Which one has the highest ionic strength? (A) B(OH)3 (B) HNO3 (C) Na2HPO4 (D) CaCO3 (E) BaSO4

86. Given the following two standard reduction potentials,determine for the standard reduction potential of the half-reaction (A) 0.40 V (B) 0.77 V (C) -0.40 V (D) -0.11 V (E) 0.11 V

87. The rate law for a reaction is found to be Rate = k[A]2 [B]. Which of the following mechanisms gives this rate law?(A) I (B) II (C) III (D) I & II (E) II & III

88. When the redox reaction in basic solution: is balanced using the smallest whole-number coefficients, the coefficient of H2O is x and the sum of all coefficients is y. What is the sum of x and y, (x + y)? (A) 9 (B) 10 (C) 11 (D) 12 (E) 13

89. Which of the followings is the best representation of the titration curve which will be obtained in the titration of a weak acid (0.10 mol ) with a strong base of the same concentration? (A) (B) (C) (D) (E)

90. The students used salicylic acid and acetic anhydride to synthesize aspirin in the experiment of “The Preparation of Aspirin”. The chemical reaction is shown as below: Which compound will react with FeCl3 to become a purple complex? (A) Salicylic acid (B) Acetic anhydride (C) Aspirin (D) Acetic acid (E) 18 M sulfuric acid

1. 根據以下資料，對於反應 TiCl4(l) → TiCl4(g)的敘述何者最合適？ (A) 任何溫度下，皆為自發反應 (B) 在低溫下可為自發反應，但在高溫時可為非自發反應 (C) 在低溫下可為非自發反應，但在高溫時可為自發反應 (D) 任何溫度下，皆非自發反應