Chemistry Practice Problems Identifying Reaction Order Practice Problems Solution: How many half-lives are required for the concentra...

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Solution: How many half-lives are required for the concentration of reactant to decrease to 12.5% of its original value?A. 3B. 1C. 1.75D. 2.75E. 2 

Problem

How many half-lives are required for the concentration of reactant to decrease to 12.5% of its original value?

A. 3

B. 1

C. 1.75

D. 2.75

E. 2 

Solution

We’re being asked to determine the number of half-lives needed to decrease the amount of a compound to 12.5% of the original value


Recall that half-life is the time needed for the amount of a reactant to decrease by 50% or one-half


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