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Antimony (sb) has two stable isotopes with isotopic masses of 120. 9038 u and 122. 9042 u. What is the natural abundance of the heavier isotope?.

Respuesta :

Answer:

average Atomic mass of thallium = 204.38

let heavier isotope is x%  

204.3833 (100) = x(204.9744) + (100-x) 202.9723

20438.33 = 2.0021x + 20297.23

x= 70.476

correct answer is 70.3%

Explanation:

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