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23 November, 09:15

Oxygen has a total of three isotopes Oxygen-16, Oxygen-17, and oxygen-18. With their a. m. u. being 15.995, 16.999, and 17.999 respectively. The percent abundance for Oxygen-17 is 0.04% and Oxygen-18 is 0.2%. Find the percent abundance for oxygen-16?

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  1. 23 November, 09:30
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    Answer: The percentage abundance of oxygen-16 isotope is 99.76 %

    Explanation:

    We are given:

    Three isotopes of oxygen are there, O-16, O-17 and O-18

    Mass of Oxygen-16 isotope = 15.995 amu

    Mass of Oxygen-17 isotope = 16.999 amu

    Mass of Oxygen-18 isotope = 17.999 amu

    Percentage abundance of Oxygen-17 isotope = 0.04 %

    Percentage abundance of Oxygen-18 isotope = 0.2 %

    We know that:

    Percentage abundance of all isotopes together is 100 %

    So, Percentage abundance of Oxygen-16 isotope = [100 - (0.04 + 0.2) ] = 99.76 %

    Hence, the percentage abundance of oxygen-16 isotope is 99.76 %
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