Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu is 64.93 amu.
Average atomic mass = sum of masses of isotopes multiply by % of abundance
Cu - 63, mass = 62.9298 amu, % abundance = 69.09 %
Cu - 65, mass m2 = ? % abundance = 30.91 %
average atomic mass = 63.546 amu
average atomic mass = ( 62.9298 × 0.6909 ) + ( m2 × 0.3091 )
63.546 = ( 62.9298 × 0.6909 ) + ( m2 × 0.3091 )
m2 = 64.93 amu
Thus, Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu is 64.93 amu.
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