Daisy D.

asked • 09/11/19# chemistry problem, explain because I got lost doing this and its not giving me the answer that we have

The atomic mass of chlorine is 35.45 amu. Calculate the mass of the first isotope if it has a % natural abundance of 75.77% and the second isotope has % natural abundance of 24.23% and mass of 36.97 amu.

## 1 Expert Answer

Gary B. answered • 09/11/19

PhD for Chemistry and Math Tutoring

the two stable isotopes of chlorine are present at 75.77% and 24.23% respectively. Therefore the relationship between their atomic masses is as follows:

35.45 = (0.7577 x unknown amu) + (0.2423 x 36.97)

rearranging this equation gives:

unknown amu = [35.45 - (0.2423 x 36.97)]/0.7577 = 34.96 amu

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David D.

09/11/19