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Copper used in electric wires comes in two flavors (isotopes): 63Cu and 65Cu. 63Cu has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, 65Cu, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu. Calculate the actual atomic mass of 65Cu. (Your answer should have 4 places after the decimal.)

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5 answers
  1. (62.9298*0.6909)+(x*0.3091) = 63.546
    Solve for x.

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  2. 64.94 amu

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