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, 20.11 M, 13.48 M, 9.04 M, 4.06 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=72 s? _____ M