Question

If the atomic weight of CU is 63.546.There are only two natuarlly occuring isotopes of copper CU^63 and CU^65.The natural abundance of the CU^63 isotpoe must be??

Answer 1

Suppose the relative abundance of Cu63 isotope = x
63.546 = 63 * x + 65(100-x) / 100
x = 72.7%

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