Copper has two naturally occurring isotopes 63Cu and 65Cu. If the average atomic mass of copper is 63.546 u, then natural abundance of lighter isotope of Cu will be
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the 65 Cu is more lighter
(65)(80.91/100)= 20.07 UMA - The 80,91 s the mass of that Cu
(63,92)(69,09/100)=443.48 UMA
nikodiaz04pe96bb:
the answer of the 63 Cu is 43,48
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