Final Exam: Fall 2017 oxidation of NO by O3 is first onder in cach of the reacta

Question

Final Exam: Fall 2017 oxidation of NO by O3 is first onder in cach of the reactants, and its rate constant is 1.5x 107 M-11, rations of NO and 03 are cach 5.0 x 10-7 MM, what is the rate of oxidation of NO in M-s-1 NO+0) NO2 + O2 (A)3.8 x 10-6 (B)2.5x 10-14 (C) 7.5 x 10-7 (D)15 (E) 7.5 39. Which of the following phase changes are exothermic? I. Vaporization . Sublimation III Condensation (B) II only(C) IlIl only(D) I and I 40. Of the graphs below, which most accurately represents a first order reaction? A) 41. The value of 1° for the following reaction is-72 k. How many kJ of heat will be evolved when 3.0 mole of HBr is formed in this reaction? H2(g) + Br2(g) 2HBr(g) (A) double the heat will be evolved (B) the same amount of heat will be evolved. (C) two thirds the amount of heat will be evolved (D) half the amount of heat will be evolved (E) one and a half times the amount of heat will be evolved

Explanation / Answer

38.

rate = k[NO][O3] = 1.5 * 107 * 5.0 * 10-7 * 5.0 * 10-7

rate = 3.75 * 10-6

(A)

39.

(C) III only vapourisation and sublimation requires energy. but condesation ( gas to liquid state) releases energy.

40.

(B)

ln[A]t = -kt + ln[A]0

41.

(E)

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