chemistry

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Strontium-90 has half-life of 28 years. if a 1.00-mg sample was stored for 112 years. what mass of Sr-90 would remain?

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    k = 0.693/t1/2

    Substitute k in the following:
    ln(No/N) = kt
    No = 1 mg
    N = mg remaining after t time
    k from above.
    t = 112 years.

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