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Whats The Abundance Percentage Of Copper In The Earths Crust

1) assign the percent abundance of fe-57 to the variable x 2) we need to get the percent abundance for fe-58 in terms of x. like this 1 minus (0.05845 0.91754 x) the term (0.05845 0.91754 x) is the total of the other three isotopic abundances. the 1 represents 100% but expressed as a decimal value.

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