Hydrogen and bromine read according to the overall reaction H_2(g) + Br_2(g) imp

Question

Hydrogen and bromine read according to the overall reaction H_2(g) + Br_2(g) implies 2HBr(g) The correct mechanism is shown below. Use this mechanism to prose that the observed rate lass corresponds to this mechanism What this means is that you need to use the mechanism information to derive the observed rate lass for the overall reaction. We did an example in class and there are others in the textbook, for reference The reaction shown below occurs according to first order kinetics. Use the temperature and rate constant data shown along with the Arrhenius equation (only one version of the equation will work here) to calculate the value of E_4, for the reaction.

Explanation / Answer

12)

ln (k2/k1) = Ea / R [1 / T1 - 1 / T2]

ln (2.4 x 10^-3 / 1.74 x 10^-5) = Ea / 8.314 x 10^-3 [1/298 - 1/318]

Ea = 194 kJ/mol

activation energy Ea = 194 kJ/mol

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