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13 November, 18:46

Chlorine has two isotopes, 35Cl and 37Cl that have the respective percent abundance's of 75.77% and 24.23% and masses of 34.9688 amu and 36.9659 amu. Calculate the atomic weight of chlorine.

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  1. 13 November, 18:52
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    The answer to your question is 35.4527 g

    Explanation:

    Data

    Cl-35 abundance = 75.77 % mass Cl-35 = 34.9688

    Cl-37 abundance = 24.23 % mass Cl-37 = 36.9659

    Process

    1. - Convert the percents to decimals

    75.77% = 75.77/100 = 0.7577

    24.23% = 24.23/100 = 0.2423

    2. - Find the atomic weight

    Average atomic weight = Abundance 1 x Mass Cl-35 +

    Abundance 2 x Mass Cl-37

    Substitution

    Average atomic weight = (0.7577) (34.9688) + (0.2423 x 36.9659)

    Simplification

    Average atomic weight = 26.4959 + 8.9568

    Result

    Average atomic weight = 35.4527 g
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