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25 December, 19:18

What is the average atomic mass of element Y if Y consists of 57.25% of atoms with a mass of 123.90 amu and 42.75% of atoms with a mass of 122.90 amu?

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  1. 25 December, 19:20
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    The average atomic mass of Y is 123.4725 g/mol

    Explanation:

    The average mass of an element is calculated by taking the average of the atomic masses of its stable isotopes.

    The enitre atomic mass = 100 % or 1

    ⇒ this consists of 57.25 % atoms with mass 123.90 g/mol

    57.25 % = 0.5725

    ⇒ this consists of 42.75 % atoms with mass 123.90 g/mol

    42.75 % = 0.4275

    To calculate the mass of this isotope we use the following:

    0.5725 * 123.90 + 0.4275 * 122.90 = 123.4725 g/mol
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