# chemistry

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The half-life of a first order reaction is determined to be 92.0 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?

• chemistry -

You meant to say the question is: The half-life of a first order reaction is determined to be 85.5 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?

• chemistry -

Make use of the formula t=2.303/k*log[Ri/Rf]....where k=0.639/halflyf Rf=2/100Ri..

• chemistry -

Got it 519.23512
92.0 years X (multiply) with 5.64386

• chemistry -

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forbidden in the midterms and the ﬁnal exams.

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