One isotope of bromine has an atomic mass of 78.92 amu and a relative abundance of 50.69%. The other major isotope of has an atomic mass of 80.92 amu and a relative abundance of 49.31%? What is the average atomic mass of bromine?

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Answer 1 · 2016-01-01T06:39:27

The average atomic mass of Br is 79.92 u.

Multiply the atomic mass of each isotope times its percent abundance in decimal form. Add them together.

#"Average atomic mass of Br"##=##(78.92xx0.5069)+(80.92xx0.49331)="79.92 u"#