78. The reduction potentials for Au3+ and Cr3+ are as follows: (A) –7.37 × 102 kJ (B) –5.79 ×102 kJ (C) –1.6 × 102 kJ (D) 7.37 × 102 kJ (E) 10 × 102 kJ

78. The reduction potentials for Au³⁺and Cr³⁺are as follows:
(A) –7.37 × 10² kJ
(B) –5.79 ×10² kJ
(C) –1.6 × 10² kJ
(D) 7.37 × 10² kJ
(E) 10 × 10² kJ

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統計： A(0), B(27), C(0), D(0), E(0) #3233344

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86. Carminic acid, a naturally occurring red pigment extracted from the cochineal insect, contains 53.66% C, 4.09% H and 42.25% O by mass. A titration required 10.00 mL of 0.5 M NaOH to neutralize 2.46 g carminic acid. Assuming there is only one acidic hydrogen per molecule, what is the empirical formula and molecular formula of carminic acid? (Na = 23.0 g/mole) (A) empirical formula: C22H20O13； molecular formula: C44H40O26 (B) empirical formula: C22H20O13； molecular formula: C22H20O13 (C) empirical formula: C44H40O26； molecular formula: C22H20O13 (D) empirical formula: C26H20O10； molecular formula: C26H20O10 (E) empirical formula: C26H20O10； molecular formula: C52H40O20

78. The reduction potentials for Au³⁺and Cr³⁺are as follows:
(A) –7.37 × 10² kJ
(B) –5.79 ×10² kJ
(C) –1.6 × 10² kJ
(D) 7.37 × 10² kJ
(E) 10 × 10² kJ

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78. The reduction potentials for Au3+ and Cr3+ are as follows:(A) –7.37 × 102 kJ(B) –5.79 ×102 kJ(C) –1.6 × 102 kJ(D) 7.37 × 102 kJ(E) 10 × 102 kJ

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相關試題

相關試卷

78. The reduction potentials for Au³⁺and Cr³⁺are as follows:
(A) –7.37 × 10² kJ
(B) –5.79 ×10² kJ
(C) –1.6 × 10² kJ
(D) 7.37 × 10² kJ
(E) 10 × 10² kJ