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11 July, 02:24

An element has two isotopes. One has a mass of 5.03 amu and an abundance of 25%, the other has a mass of 7.20 amu and an

abundance of 75%. What is the average atomic mass of the element?

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  1. 11 July, 02:37
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    Average atomic mass = 6.6575.

    Explanation:

    As fractions the abundance is 1/4 and 3/4.

    The average atomic mass = (5.03 + 3 (7.20) / 4

    = 6.6575.
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