Question

give the average mass of chlorine and bromine
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Answer 1

Answer:

79.904 u

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Answer 2

$\fbox\green{Answer}$

The chlorine isotope with 18 neutrons has an abundance of 0.7577 and a mass number of 35 amu. To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.

The average atomic mass of Br is 79.91 u. There are two ways to solve this problem. Let's assume we have 10 000 atoms of Br. Then 5069 atoms will have mass 78.92 u, and 4931 atoms will have mass 80.92 u.