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lalalalalala
Lv 6
lalalalalala asked in Science & MathematicsChemistry · 1 decade ago

Percentage Abundance of Copper?

How would I solve for the percentage abundance of copper? All that I am given is that the isotopes are Cu-63 & Cu-65 and that the average atomic mass is 63.5 amu.

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  • SciMann
    Lv 7
    1 decade ago
    Favorite Answer

    Let UNITs guide you; always USE THEM in your calculation to prevent errors

    Firstly, the eqn: ave value of A + B = fraction A* value A + fraction B * value B

    ______________fB = 100%/100% - fA

    _____________ave value = 63.5 = fA * 63 + (1 - fA) * 65

    SOLVE for fA and fB

    Basic mathematics is a prerequisite to chemistry – I just try to help you with the methodology of solving the problem.

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