51) Which of the following represents the equation for a first-order half-life? A) + 1/2 – kAl. B) + 12 = 0.623 9)1/2 = 2[4] D)t1/2 = 21 E) 1/2 = [A]o 52) Which of the following represents the equation for a second-order half-life? A) t1/2 = WAL B)t1/2 = 0.693 C) 1/2 – 2K 0.693 D) t1/2 = Tai E)t1/2 = [A]o 53) Which of the following represents the equation for a zero-order half-life? A) + 1/2 – BA1 B)t1/2 = 0,023 C)1/2 FAK D)+1/2 – Flo E) t1/2 T. 54) The rate constant for a second-order reaction is 0.54 M-Is-1. What is the half-life of this reaction if the initial concentration is 0.33 M?