# determine initial amount of element given half life

## Summary

The initial amount of a radioactive element can be determined by using the expression 1 \ , where n is the number of half-lives. The half-life of the reaction can be calculated using Equation 3. 2 The remaining concentration can be obtained by multiplying the initial concentration by 1/2 to the power corresponding to the number of half-lives. 2 The initial amount can then be calculated by subtracting the remaining concentration from the initial concentration and dividing by the initial concentration, multiplying the fraction by 100 to obtain the percent completion. 2

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Summary We can determine the amount of a radioactive isotope remaining after a given number half-lives by using the following expression: $\mathrm{amount\: remaining=initial\: amount\times \left ( \dfrac{1}{2} \right )^n} \label{Eq1}$ where n is the number
11.2: Half-Life - Chemistry LibreTexts
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The answer can be found by examining Figure 31.5.1, which shows how the number of radioactive nuclei in a sample decreases with time. The time in which half of the…
31.5: Half-Life and Activity - Physics LibreTexts
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Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value. The term is most commonly used in relation to…
Half-Life Calculator
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Find Initial Amount and Amount After Time From Half - Life (y=ae^ (kt)) 19,971 views Sep 17, 2019 43 Dislike Share Save Mathispower4u 234K subscribers Subscribe This video explains how to...
Find Initial Amount and Amount After Time From Half-Life (y=ae^(kt ...