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@30% E 8:03 AM psu.instructure.com No Service imited attempts, 60 minutes each, only highest score o Question 2 1 pts What is half life? O the time required for the amount of a reactant remaining to drop to half of its original value the time required for a specific amount of reactants to form half the maximum amount of products O the time required for the amount of products to be equal to half of the rate constant O the time required for the amount of products formed to be equal to half of the reactants O the time required for the amount of reactant used up to equal half of the products formed Previous Next

Explanation / Answer

The correct answer is Option A

Half life is the time required for the amount of reactant remaining to drop to half of its original value

Half-life for zero order reaction

[Ao] = [At] + kt

[At] must be [Ao]/2 for half life, hence we get

[Ao] = [Ao]/2 + kt

t = [Ao]/2k

Half-life for first order reaction

ln(Ao/At) = kt

[At] must be [Ao]/2 for half life, hence we get

ln(Ao/(Ao/2)) = kt

t = ln(2)/k

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