QUESTION 31

1. For the second-order reaction below, the rate constant of the reaction is 9.4 × 10^–3 M^–1s^–1. How long (in seconds) is required to decrease the concentration of A from 2.16 M to 0.40 M?

   	2A → B	rate = k[A] 2

   		2.2 × 102 s
   		2.0 × 101 s
   		1.9 × 102 s
   		1.8 × 102 s
   		7.8 × 101 s