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1 January, 18:28

The atomic weight of a newly discovered element is 98.225 amu. it has two naturally occuring isotopes. one isotope has a mass of 96.780 amu. the second isotope has a percent abundance of 41.7%. what is the mass of the second isotope?

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  1. 1 January, 18:45
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    Atomic weight of an element can be calculated as follows:

    average atomic weight =

    (atomic weight of first isotope) (its percentage of abundance) +

    (atomic weight of second isotope) (its percentage of abundance)

    average atomic weight = 98.225 amu

    atomic weight of first isotope = 97.780 amu

    its percentage of abundance = 1 - 0.417 = 0.583

    atomic weight of second isotope = ?

    its percentage of abundance = 0.417

    So, just substitute in the above equation to get the atomic weight of the second isotope as follows:

    98.225 = (97.78) (0.583) + (mass2) (0.417)

    atomic weight of second isotope = 98.847 amu
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