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22 September, 06:49

An unknown element is found to have two naturally occurring isotopes, 200X and 210X with atomic masses of 200.028 and 210.039 respectively. If the percent abundance of 200X is 40.00%, what is the average atomic mass of X.

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  1. 22 September, 06:57
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    The average atomic mass of X is 206.0346

    Explanation:

    Atomic mass of 200X = 200.028

    % abundance of 200X = 40% = 40/100 = 0.4

    Atomic mass of 210X = 210.039

    % abundance of 210X = 100% - 40% = 60% = 60/100 = 0.6

    Average atomic mass of X = (0.4*200.028) + (0.6*210.039) = 80.0112 + 126.0234 = 206.0346
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