The OH· Radical Disproportionates According to the Elementary Chemical Reaction

The OH· radical disproportionates according to the elementary chemical reaction This reaction is second-order in OH·.The rate constant for the reaction is 2.0 × 10^-12 cm³/molecules at room temperature.If the initial OH· concentration is 1.4 × 10¹³ molecules/cm³,what is the first half-life for the reaction?

A) 2.8 × 10¹ s
B) 3.6 × 10^-2 s
C) 1.8 × 10^-2 s
D) 3.5 × 10¹¹ s
E) 7.1 × 10^-14 s