Chemistry & Chemical Reactivity

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



Chemistry & Chemical Reactivity

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

If you have 1.0 μg of Tc, what mass remains at the end of 24 hours?

Interpretation Introduction


The mass of technetium-99 after 24 hour has to be calculated.

Radiocarbon dating: The dynamic equilibrium exists in all living organism by exhaling or inhaling, maintain the same ratio of 12C and 14C that takes in. when the living organism dies, the intake of 14C stops and it’s the ratio no longer exhibits equilibrium; undergoes radioactive decay.

Half-life period: The time required to reduce to half of its initial value.

Formula used to calculate half-life:

t1/2=0.693kwhere,kis rate constant.(or)ln[N]t- ln[N]0= -kt



Time = 24hours.

The amount of technetium =1.0μg.

The half-life of technetium-99 is 6.01hours (Constant).

The half-lives =Tt1/2

=246.01=3.99 4 Half-lives

Now calculate the mass remains after 24 hours,

ln[N]t- ln= -kt[N]t=[N]0(1/2)n[N]t=(1

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