Chemistry

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Please help me solve this question:

A layer of peat beneath the glacial sediments of the last ice age had a carbon-14 content of 25% of that found in living organisms. How long ago was this ice age?

  • Chemistry -

    You will need k and you don't have information to get it. Look up the half life of C-14 which I think is in the neighborhood of 5800 years. Use the exact number when you find it.
    Then k = 0.693/t1/2

    ln(No/N) = kt
    Substitute 100 for No.
    N = 25
    k from the half life
    Solve for t.

  • Chemistry -

    .36

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