Respuesta :

shieldsbradley2

Answer:

the awnser is True

Explanation:

Its hard to explain

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Answer
True

Why
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%

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

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