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1 September, 22:57

Suppose that an element has two isotopes. The average atomic mass of the element is 45.737 u. One isotope has a mass of 40.149 u and an abundance of 37.46 %. Calculate the mass of the second isotope.

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  1. 1 September, 23:04
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    The answer to your question is 49.08 u

    Explanation:

    Data

    Average atomic mass = 45.737 u

    Isotope 1 = 40.149 u abundance = 37.46%

    Isotope 2 = ?

    Process

    1. - Calculate the abundance of isotope 2

    abundance isotope 1 + abundance isotope 2 = 100%

    37.46 + abundance isotope 2 = 100

    abundance isotope 2 = 100 - 37.46

    abundance isotope 2 = 62.54

    2. - Calculate the mass of isotope 2

    Average atomic mass = (abundance x mass isotope 1) + (abundance x

    mass isotope 2)

    45.737 = (0.3746 x 40.149) + (62.54 x mass isotope 2)

    mass isotope 2 = [45.737 - (0.3746 x 40.149) ] / 62.54

    mass isotope 2 = [45.737 - 15.0398] / 62.54

    mass isotope 2 = 30.6972/62.54

    mass isotope 2 = 0.4908 x 100

    mass isotope 2 = 49.08 u
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