Recall that half-life is the time needed for the amount of a reactant to decrease by 50% or one-half. One way to determine the amount remaining after x half-lives is:
where [A]t = concentration after x half-lives, [A]0 = initial concentration and x = number of half-lives.
We’re given [A]0 = 26.0 g and x = 3 half-lives. Solving for [A]t:
If a solution containing 26.0 g of a substance reacts by first-order kinetics, how many grams remain after three half-lives?
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