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use the nuclear decay equation to find out how much a 7mg sample of iodine 128 remains after 116 minutes if the half life of this isotope is 25 minutes.

  • chemistry - ,

    k = 0.693/t1/2
    k = 0.693/25 min = ??

    Substitute k into the equation below.
    ln(No/N) = kt
    No = 7 mg
    N = unknown
    k = from above.
    t = 116 minutes.
    Solve for N.

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