The half-lives required for the concentration of reactant to decrease to 12.5% of its original value are 3.
Half life of any radioactive material is the time period required to decompose half of that material.
Half life is the consumption of half of the reactant,.
Given is the 12.5% of the reactant's original concentration is decreased.
For 50 % half life is 1.
For 25%, half life would be 2.
And for 12.5%, half life would be 3.
Thus, 3 half lives are required for the concentration of reactant to decrease to 12.5% of its original value.
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