Which of the following represents the expression for 3/4th the life of a first-order reaction? — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

For a first-order reaction, t = 2.303/K log(a / (a-x)). For 3/4th completion, x = 3/4 a, so remaining reactant (a-x) = 1/4 a. Thus, t_3/4 = 2.303/K log(a / (a/4)) = 2.303/K log(4).