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    Nicolas Sanchez
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    A sample of an element consists of two isotopes. The relative abundance of each isotope is shown in the table.

    [see table below]

    What is the relative atomic mass of the element in this sample?

    A. 31.0
    B. 38.8
    C. 39.0
    D. 62.0
    E. 69.8
    F. 70.0

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  • BMAT 2020 Section 2 Q2

  • Paris

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    July 21, 2021 at 6:03 pm
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    We can use the typical isotope equation but we do not know the Ar of each isotope. But we can find it from the mass number but we do not have that either, but we can find it. Just add the protons and the neutrons of each isotope. Then we have the equation ready.

    The answer is E.