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More information is available on this project's attribution page.Then divide by the initial concentration, multiplying the fraction by 100 to obtain the percent completion.Solution: A We can calculate the half-life of the reaction using Equation 14.28: Thus a first-order chemical reaction is 97% complete after 5 half-lives and 100% complete after 10 half-lives.This is not true for zeroth- and second-order reactions.

The half-life of a first-order reaction is The Half-Life of a First-Order Reaction This plot shows the concentration of the reactant in a first-order reaction as a function of time and identifies a series of half-lives, intervals in which the reactant concentration decreases by a factor of 2.

Using ) and a characteristic value for each radioactive isotope.