For the overall chemical reaction shown below, which one of the following statem

Question

For the overall chemical reaction shown below, which one of the following statements can be rightly assumed? 2H_2S (g) + O_2 (g) rightarrow 2S (s) + 2H_2O (l) A) The reaction is third-order overall. B) The reaction is second-order overall. B) The reaction is second-order overall. c) The rate law is, rate = k [H_2 S]^2 [O_2]. D) The rate law is, rate = k [H_2 S] [O_2]. E) The rate law cannot be determined from the information given. For the chemical reaction A rightarrow B + C, a plot of [A]_ (the concentration of A at time t) versus time is found to give a straight line with a negative slope. What is the order of reaction with respect to A? A) zeroth B) first C) second D) Such a plot cannot reveal the order of the reaction. The Arrhenius equation is K = Ae^-E_g/RT. The slope of a plot of lnk vs. 1/T is equal to A) -k B) k C)A D) E_a E) -E_a/R For the reaction BrO_3^- + 5Br^- + 6H^+ rightarrow 3Br_2 + 3H_2O at a particular time, lambda [BrO_3]/lambda t = 6.0 times 10^-4 M/s. What is lambda [Br]/lambda t at the same instant? A) 13 M/s B) 3.0 times 10^-3 M/s C) 7.5 times 10^-2 M/s

Explanation / Answer

1)

We can tell about the rate law or order from the overall reaction. For this elementary reaction must be given

Answer: E

2)

integrated rate law for 2nd order reaction:

1/[A]o = 1/[A] - k*t

integrated rate law for 1st order reaction:

ln [A] = –kt + ln [A]o

integrated rate law for zero order reaction:

[A] = [A]o – k*t

[A] vs t is straight line for 0 order reaction

Answer: A

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