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Iodine-131 has a half life of eight days. What mass of iodine-131 would remain from a 20g sample after 32 days?

  • chemistry - ,

    k = 0.693/t1/2

    ln(No/N) = kt
    No = 20g
    N = solve for this
    k from above.
    t = 32 days.

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