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15 March, 20:48

The half-life of hydrogen-3 is 12.3 years. Given 100 g of hydrogen-3, how many grams will be left after 5

half-lives?

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Answers (1)
  1. 16 March, 00:09
    0
    After 5 half life the amount remains as 3.125 g

    Explanation:

    After each half life the quantity becomes half

    so we know that initial amount is 100 g

    so after 1st half life amount is half so it left as

    m = 50 g

    now after 2nd half life amount again becomes half

    m = 25 g

    after 3rd half life it is again half so remaining amount is

    m = 12.5 g

    after 4th half life the amount becomes half again

    m = 6.25 g

    Now after 5th half life the amount remains as

    m = 3.125 g
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