# 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 libretexts.org

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 libretexts.org

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 calculator.net

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 ... Solution: we know the initial amount final amount and elapsed time Recall the half - life formula Half - life is already isolated, so simply substitute the appropriate variables and evaluate. Check to see…
5 Ways to Calculate Half Life - wikiHow wikihow.com

To calculate the half-life of an element, go to the half-life tab: Enter the initial and remaining quantity of the element in the corresponding input boxes. Enter the total time…
Half-Life Calculator - radioactive decay chemical calculator calculators.tech

You can find the half - life of a radioactive element using the formula: where t1/2 is the half - life of the particle, t is the elapsed time, N0 is the quantity in…
Half-Life Calculator - Radioactive decay calculator gigacalculator.com