- Write the overall reaction for the mechanism proposed below and identify any r

Question

- Write the overall reaction for the mechanism proposed below and identify any reaction intermediates.

Step 1: C4H9Br --> C4H9^+ + Br^-

Step 2: C4H9^+ + H2O --> C4H9OH2^+

Step 3: C4H9OH2^+ + H2O ++> C4H9OH + H3O^+

- The presene of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 88 kJ/mol to 53kJ/mol. (a) By what factor does the rate of the reaction increase at 300. K, all other factors being equal? (b) By what factor would the rate change if the reaction were carried out at 400. K instead?

Explanation / Answer

a)
UsE:
K= A* e^ (-Ea/RT)

At activation energy Ea1, rate be K1
K1= A* e^ (-Ea1/RT) .... eqn 1

At activation energy Ea2, rate be K2
K2= A* e^ (-Ea2/RT) ...eqn 2

divide eqn 1 by eqn 2
K1/K2 = e^(88000-53000)/ (8.314*300)
K1/K2 = 1.2*10^6
Answer: 1.2*10^6 times

b)
use:
K1/K2 = e^(88000-53000)/ (8.314*400)
K1/K2 = 3.7*10^5
Answer: 3.7*10^5 times

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.