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chemistry

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It takes 1 hour and 17 min. for a 1.000g sample of a certain isotope to decay to 0.121g. What is the half-life of this isotope? plssss helpp

  • chemistry -

    ln(No/N) = kt.
    No = 1.000
    N = 0.121
    t = 67 min
    solve for k, then
    k = 0.693/t1/2

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