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How to figure out half-lives

Half-live of Indium-116 is 14 seconds. How long will it take for 32 grams of this istotopw to decay to 1.0 grams. I know the answer is 70seconds but do not know how to get it!

  • Chemistry -

    Every 14 seconds, the isotope's mass is halved.

  • Chemistry -

    You can iterate as TutorCat suggests, or you can follow this formula
    k = 0.693/t1/2
    Solve for k and substitute it into the equation below.
    ln(No/N) = kt
    No = 32
    N = 1
    k from above.
    solve for t.

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