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21 August, 18:03

an element is a mixture of two isotopes. one isotope has an atomic mass of 34.96885 amu and has an abundance of 75.53%. The other isotope has an atomic mass of 36.96590 amu. Calculate the average atomic mass and identify the element?

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  1. 21 August, 18:05
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    35.4575 amu

    Explanation:

    We use the relative abundance of each of the isotopes.

    Let the isotopes be A and B.

    Since A is having an abundance of 75.53, the abundance of B would be 100 - 75.53 = 24.47%

    The average atomic mass is calculated as follows;

    (75.53/100 * 34.96885) + (24.47/100 * 36.96590) = 26.4119 + 9.0456 = 35.4575 amu
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