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28 April, 22:28

Naturally occurring chlorine that is put in pools is 75.53 percent 35Cl and 24.47 percent Cl. Calculate the average atomic mass.

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  1. 28 April, 22:50
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    A_r = 35.5

    The average atomic mass of Cl is the weighted average of the atomic masses of its isotopes.

    We multiply the atomic mass of each isotope by a number representing its relative importance (i. e., its % abundance).

    Thus,

    0.7553 * 35 u = 26.4 u

    0.2447 * 37 u = 9.05 u

    TOTAL = 35.5 u
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