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Iodine-131, a beta emitter, has a half-life of 8 days.How many grams of a 10.0g sample of iodine-131 would remain after 56.0 days?

  • chemistry -

    k = 0.693/t1/2
    ln(No/N) = kt
    No = 10.0g
    N = unknown
    k from above
    t = 56

    Another way to solve this:
    56 days is 7 half lives so
    10/27 = ?

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