Question

please answer these questions

Given the following complex reaction mechanism for the reaction H2(g) + Br2(g) → 2 HBr (g): Br2 → 2 Brº (rate constant ka) Br + H2 → HBr +H* (rate constant kb) Hø + Br2 → HBr + Br" (rate constant ke) H + HBr → H2 + Brº (rate constant kd) Br + Brº Br2 (rate constant ke) Which of the following is true? The rate constant for the termination step is ka. The steady-state approximation can be used to set the concentration of [H.] and [Br.] to be constant. There are two propagation steps in this mechanism. The reaction kinetics will only depend on the last rate constant Given the data below, which of the following statements is true? Time (s) 0 1066 2132 3198 [A] mol dm 3 1.5 x 10-2 7.5 x 10-3 3.75 x 10-3 1.88 x 10-3 Please select all that apply: The reaction is first order. The reaction is second order. The concentration after 700 seconds will be 0.95 x 10-2 mol dm3 The half-life is independent of temperature.

Answer 1

YV Hz () + Brz (6) -2 #B~ @) the reactiow steps are: Initiation Step: BruBr2 er Propagation steps: (i) si det to HBr + H. (i) H I Bruder & HR & Br (in) 4. der ka dhe & Bi Termination step: Bi tar ke Bir schhe rate courant for the termination step in Ka (Falsel # The steady estate approximation can be used on intermediate. Here 4 & Bi both are intermediate of the reaction. u The Beady state approximation can be used to set the conconvation of it ] 4 [Br] to be comtarta There are two propagation step in. this mechanism & Fake Because 3 propagation steps are & vesent) # The reaction kine tier will depend on rate de termining step. Last nef unnot rate de termining te So, the reaction kinetics will only defend on the contrate comtanske= false

F G L HLIK LM Times) tatimol/dm3) In/Alt 1/jAlt 1.50E OZ 4.199705078 6,670 +01 7.50E 03 4.892852258 1.33E+02 2132 3.75E 03 5.585999439 267E+02 3198 1.8BE 03 6.276483502 5.32E+02 1st order kinetics 2nd order kinetics 6.00E+02 500 1000 1500 2000 2500 3000 3500 5 00E+02 y=01434x+ 20 284 R-09207 4.00E+02 y=0 0006x-4 2002 R=1 1/'Alt 300E+02 2.00E+02 100E+02 0.00E+00 0 500 1000 1500 2000 Time(s) 2500 3000 3500 Time(s)

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