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Chapter 2: Q.23E (page 67)

Average atomic masses listed by IUPAC are based on a study of experimental results. Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundance (50.69% and 49.31%) were determined in earlier experiments. Calculate the average atomic mass of bromine based on these experiments.

Short Answer

Expert verified

Bromine average mass = (0.5069×78.9183) +(0.4931×80.9163)

Avg. atomic mass = (40.003+39.899) amu

= 79.90 amu

Step by step solution

01

– Determine the above solution

50.60% =\(\frac{{50.60}}{{100}} = 0.5069\)

49.31% = \(\frac{{49.31}}{{100}} = 0.4931\)

02

– Determine the Formula of Average mass

Average mass =\(\sum\limits_i {{{(fractional\,\,abundance \times isotopic\,mass)}_i}} \)

Bromine average mass = (0.5069×78.9183)+(0.4931×80.9163)

Avg. atomic mass= (40.003+39.899) amu

= 79.90 amu

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