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    How do I calculate the percentage abundance of 10B in a naturally occuring sample of boron?
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    (Original post by B S V)
    How do I calculate the percentage abundance of 10B in a naturally occuring sample of boron?
    you need to know which isotopes are present and the relative mass (weighted average of the isotopic masses)
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    (Original post by charco)
    you need to know which isotopes are present and the relative mass (weighted average of the isotopic masses)
    Umm.... The question says:
    In a sample, Boron exist as two isotopes 10B and 11B
    Calculate the percentage abundance of 10B in this naturally occuring sample of Boron.
    Therefore how would I answer this question?
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    (Original post by B S V)
    Umm.... The question says:
    In a sample, Boron exist as two isotopes 10B and 11B
    Calculate the percentage abundance of 10B in this naturally occuring sample of Boron.
    Therefore how would I answer this question?
    You must use the relative mass.

    relative mass = [(isotope mass1 x %abundance1) + (isotope mass2 x %abundance 2)]/100

    and you know that

    %abundance1 + %abundance2 = 100

    You have two simultaneous equations with two unknowns - solve them.
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    Thank you very much, this has been very helpful!!,
 
 
 
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