A Reaction Was Experimentally Determined to Follow the Rate Law

Multiple Choice

A reaction was experimentally determined to follow the rate law, Rate = k[A]² where k = 0.456 s^-1M^-1. Starting with [A]_o = 0.500 M, how many seconds will it take for [A]_t = 0.250 M

A) 2.85 x 10^-2 s
B) 1.14 x 10^-1 s
C) 1.52 s
D) 4.39 s
E) 5.48x10^-1 s