science help Please

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There are 3.29g of Iodine 126 remaining in a smaple originally containing 26.3 g of iodine 126 the half life of iodine 126 is 13 days. How old is the sample?

  • science help Please -

    k = 0.693/t1/2.

    Then ln(No/N) = kt
    No = 26.3
    N = 3.29
    k from above.
    solve for t.
    Post your work if you get stuck.

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