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If the amount of raidoactive iodine-123 in a sample decreases from 0.4 to 0.1 g in 26.2 hours, what is the half-life of iodine-123?

  • Chemistry - ,

    ln(No/N) = kt
    No = 0.4
    N = 0.1
    t = 26.2 hours.
    Solve for k. Then
    k = 0.693/t1/2
    Solve for t1/2>/sub>

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