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

The isotope of polonium that was most likely isolated by Marie Curie in her pioneering studies is polonium-210. A sample of this element was prepared in a nuclear reaction. Initially, its activity (α emission) was 7840 dpm. Measuring radioactivity over time produced the data below. Determine the half-life of polonium-210.


Interpretation Introduction


The half-life of polonium-210 has to be determined.

Concept Introduction:

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


Activities for polonium-210 are 7840, 7570,7300,5920,5470.

Time for polonium-210 is 0, 7, 14, 56 and72.

The seventh activity;

ln[AAo]= -k(t)ln[75707840]= -k(t)ln=0.965= -k(7)-0.0356k=0.005

The fourteenth activity;

ln[AAo] = -k(t)ln[73007840] = -k(t)ln=0.9311 = -k(14) -0.07138k = 0.005

The fifty sixth activity

ln[AAo]= -k(t)ln[59207840]= -k(t)ln = 0

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