We’re being asked to calculate the amount of A remaining after 8 half-lives if we start with 0.882 M A.
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.
For the first-order reaction, the initial concentration of reactant A is 0.882 M. What would be concentration be after 8 half-lives?
a. 0.110 M
b. 0.353 M
c. 0.00345 M
d. 0.00143 M
e. 0.00200 M
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