B) stays the same if the reaction is first order luiCss 8t whether the reaction

Question

B) stays the same if the reaction is first order luiCss 8t whether the reaction is exothermic or endothermic 21) The decomposition of [A] in solution at 80 °C procee ds via the following reaction: A (aq) B (aq) The dependence of the rate constant on temperature is studied and the graph below is prepared from the ro -6 X2-X1 S-8 -10 0.0019 0.0020 0.0021 0.0022 1/T What is the energy of activation (kJ/mol) for this réaction? A) 1.9 x 104 22) The mechanism for formation of the product X is: B) 1.6× 105 C) 160 D)4.4 x 10-7 E) 4.4 x 10-4 A + B- C+D (slow) . (fast) The intermediate reactant in the reaction is

Explanation / Answer

Arhenius equation is K= Ko*e(-Ea/RT), Ea = activation energy and R= gas constant = 8.314 J/mole.K

taking ln, the equation becomes lnK= lnKo-Ea/RT

so a plot of lnK vs 1/T ( T in K) gives straight line whose slope is -Ea/R.

from the graph, the slope = (-5.5-(-11)/ (0.0019-0.00218)=-19643

-Ea/R=-19643

E= 19643*8.314 J/mole =163312 J/mole= 163.312 Kj/mole, close answer is C. 160 Kj/mole

2. A and B are reactants and X is the product. So intermediate is D.

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