Answer to Question #115666 in General Chemistry for Nora

Question

If a first order reaction has a half-life of 0.693 min, how long will it take (in minutes) for the concentration of reactant A to drop to 0.278 M, if you start with a 0.477 M solution?

Answer 1

The time required for the consumption of reactant A from 0.477 M to 0.278 M is calculated as shown in equation (1) where [A]o is the initial concentration, [A] is the final concentration, t is the time required, and k is the rate constant.