Question

Copper has two naturally occuring isotopes. Cu-63 has an atomic mass of 62.9296 amu and an abundance of 69.15%. What is the atomic mass of the second isotope? What is its nuclear symbol?​

Answer 1

Answer:

Let x be the atomic mass of the 2nd isotope

The isotopes occur in the proportion:

Cu-63 with atomic mass 62.9296 amu: 69.15%

Cu-x: 100–69.15= 30.85%

Using this information average atomic mass= 63.546 amu since average atomic mass = (relative abundance of each isotope* relative isotopic mass of each)/100

Therefore,

63.546=((62.9296*69.15)+(x*30.85))÷100

63.546=43.5158184+0.3085x

0.3085x= 63.546-43.5158184

x= 20.0301816÷0.3085

x=64.9276 amu

Therefore, the atomic mass of the second isotope of Cu is 64.9276 amu

Explanation:

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