Suppose that you know that the reaction shown below is the first order reaction. What is the concentration of A after 1.5 min of the beginning of reaction if the initial concentration of Ais 0.78 M and the rate constant of reaction is 0.037 s^-1? A → B a. 0.75 M b. 0.72M c. 0.028 M d. 0.22 M e. 0.74 M