Question

A reaction A B has the following time dependence for the concentration of [A] vs time. For t=(0 s, 5 s, 10 s, 15 s, 25 s) the concentration of [A]=(30.00 M, 16.85 M, 11.72 M, 8.98 M, 6.12 M). The initial concentration of [A] is the value at t=0 s. (A)Calculate the values of the rate constant k assuming that the reaction is first order. What is the value of k at 5 s? s-1 What is the value of k at 10 s? s-1 What is the value of k at 15 s? s-1 What is the value of k at 25 s? s-1 (B)Calculate the value of k assuming that the reaction is second order. What is the value of k at 5 s? M-1s-1 What is the value of k at 10 s? M-1s-1 What is the value of k at 15 s? M-1s-1 What is the value of k at 25 s? M-1s-1 (C)Use your results from parts A and B above to decide what the order of the reaction is for your data. (Enter 1 or 2) (D)What is the concentration of [A] at time t=69 s? M

Answer 1

(A) The reaction is first order

(i) Value at k=5 seconds

(ii) Value at k=10 seconds

(iii) Value at k=15 seconds

(iv) Value at k=25 seconds

B) The reaction is first order

(i) Value at k=5 seconds

(ii) Value at k=10 seconds

(iii) Value at k=15 seconds

(ivi) Value at k=25 seconds

C) Since the rate constant are more closer for second order reaction, heence ther eaction is second order

(2)

D)

Value at At at t = 69 seconds