Question

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Answer 1

Answer:

79.91

Explanation:

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The average atomic mass of Br is 79.91 u

Method

MethodThe average mass is the mass of each isotope multiplied by its percentage. Thus,

MethodThe average mass is the mass of each isotope multiplied by its percentage. Thus,Average mass = 50.69 % × 78.92 u + 49.31 % × 80.92 u = 40.00 u + 39.90 u = 79.91 u

MethodThe average mass is the mass of each isotope multiplied by its percentage. Thus,Average mass = 50.69 % × 78.92 u + 49.31 % × 80.92 u = 40.00 u + 39.90 u = 79.91 uThe second method is easier, but it doesn't explain intuitively why the answer is the average atomic mass.