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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Copper(II) acetate containing 64Cu is used to study brain tumors. This isotope has a half-life of 12.7 hours. If you begin with 25.0 μg of 64Cu, what mass remains after 63.5 hours?

Interpretation Introduction

Interpretation: The remaining mass of copper-64 isotope in copper acetate after 63.5hours has to be calculated.

Concept introduction:

Half–life period: It is the time required for the reactant (substrate) concentration to reduce to the one-half of its initial concentration.

Explanation

Given,

Half-life of copper =12.7 hours

Initial concentration of copper-64=25.0μg

Time=63.5hours.

The number of half-life after 63.5hours =Tt1/2=63.512.7=5 half-lives

  • The first half-life begin with 25.0μg

  25.02=12.5μg

  • The second half-life,

  12

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