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12 July, 14:04

If you have 222 g of radioisotope with a half-life of 5 days, how much isotope would remain after 15 days?

b. what percentage of a radioactive isotope would remain after four half-lives?

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  1. 12 July, 17:17
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    If the half life is 5 days, you would have to divide 222 by 2 3 times.

    so 222/2 = 111g

    111/2 = 55.5g

    55.5/2 = 27.75g

    after four half life the mass would be

    27.75/2

    13.875g

    the percent would be

    13.875/222

    = 6.25%
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