i need help

with part b please!

11) Butadiene, C4H6 (used to make synthetic rubber and latex paints) dimerizes to C8H12 with a rate law of rate =0.014L/(mol s) [C4H6]2. If the initial concentration of Butadiene is 0.025M, a). What will be the concentration of C4H6 after 3.0 hours? b). What is the half life of the reaction? 1/A1]+A0=A1/2[A1]=(kt+1/[A0])1[A1]=(0.014.10800+1/0.025)1[A1]=5.23103n