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28 August, 20:08

Nitrogen-13 has a half-life of 10 minutes. how much of a 128 mg sample would remain after 20 minutes?

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  1. 28 August, 21:10
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    The half-life of a radioisotope describes the amount of time it takes for said isotope to decay to one-half the original amount present in the sample.

    Nitrogen-13, because it has a half-life of ten minutes, will experience two half-lives over the course of the twenty minute period. This means that 25% of the isotope will remain after this.

    0.25 x 128mg = 32mg

    32mg of Nitrogen-13 will remain after 20 minutes.
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