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Concept explainers
(a)
Interpretation:
The time required to decrease the activity of P-32 to 68 % of its original activity needs to be determined.
Concept introduction:
All the radioactive reactions are first order reactions. For first order reaction, the relation between rate constant, k and half-life time is as follows:
Also, the integrated rate expression can be written as follows:
Here, t is time required to decrease the amount of substance from
(b)
Interpretation:
The number of P-32 atoms sinks after 755 days needs to be determined.
Concept introduction:
All the radioactive reactions are first order reactions. For first order reaction, the relation between rate constant, k and half-life time is as follows:
Also, the integrated rate expression can be written as follows:
Here, t is time required to decrease the amount of substance from
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Chapter 18 Solutions
Chemistry: Principles and Reactions
- 239Pu is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of the 239Pu present today will be present in 1000 y?arrow_forwardFluorine-18 is a radioactive isotope that decays by positron emission to form oxygen-18 with a half-life of 109.7 min. (A positron is a particle with the mass of an electron and a single unit of positive charge; the equation is F918O188+e+10 Physicians use 18F to study the brain by injecting a quantity of ?uoro-substituted glucose into the blood of a patient. The glucose accumulates in the regions where the brain is active and needs nourishment. (a) What is the rate constant for [lie decomposition of ?uorine-18? (b) If a sample of glucose containing radioactive fluorine-18 is injected into the blood, what percent of the radioactivity will remain after 5.59 h? (c) How long does it take for 99.99% of the 18F to decay?arrow_forward
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