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13 October, 17:13

An unkown element has been found to occur in two different stable isotopes. One isotope has an abundance of 57.21 percent and has a mass of 120.9 amu. The other isotope has an abundance of 42.79 percent and has a mass of 122.9 amu. What is the average atomic mass of the unknown element?

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  1. 13 October, 19:18
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    Answer: 121.7558 amu

    Explanation:

    Average atomic mass of the unknown element =

    (Mass of isotope 1 x Relative Abundance of Isotope 1) + (Mass of Isotope 2 x Relative Abundance of Isotope 2)

    (120.9 x 0.5721) + (122.9 x 0.4279) = 69.16689 + 52.58891

    Average mass of the unknown element = 121.7558 amu
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