carbon - 14 dating

Discussion in 'Chemistry' started by emmas, May 16, 2009.

  1. emmas Registered Member

    Messages:
    1
    I'm tearing my hair out with what i thought was a simple question and wondered if anyone can help out.
    i have to estimate the age of a water sample
    i have 0.416 mg carbon-14 atoms in total (from dissolved CO2 HCO-3 & CO-3)
    and 1.246mg of daughter nitrogen-14 atoms (N2 molecules)
    I have trawled through my book and i just can't get to grips with this can someone please give me a helping hand,
    i'm desperate,
    many many thanks to someone who can
    em.
     
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  3. zoe Registered Member

    Messages:
    1
    I'm tearing my hair out with the same question did you have any luck sorting it? I think we need to work out how many atoms are in the 0.416 mg and 1.246 mg before we can do anything but i don't know how to do this.
    If you can help please let me know.
    :shrug:
     
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  5. Nasor Valued Senior Member

    Messages:
    6,231
    You have three times as much N14 as C14, so if you assume that all the N14 came from C14, it means the C14 has gone through 2 half-lives. If not all the N14 came from C14, then I don't think the problem can be worked out with the information given.
     
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