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What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s? Please help me!!

  • Chemistry -

    ln(No/N) = kt
    No = 100g
    N = 12.5g
    k = solve for this
    t = 21.6 sec

    Then Substitute k into
    k = 0.693/t1/2 and solve for t1/2

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