Antimony has two naturally occuring isotopes, 121 Sb and 123 b. 121Sb has an atomic mass of 120.9038 u, and 123 Sb has an atomic mass of 122.9042 u. Antimony has an average atomic mass of 121.7601 u. What is the percent natural abundance of each isotope? Show work

Question

Antimony has two naturally occuring isotopes, 121 Sb and 123 b. 121Sb has an atomic mass of 120.9038 u, and 123 Sb has an atomic mass of 122.9042 u. Antimony has an average atomic mass of 121.7601 u. What is the percent natural abundance of each isotope? Show work

Answer 1

121Sb:

Atomic mass of 121Sb = 120.9038 u
Average atomic mass of antimony = 121.7601 u

Percent natural abundance of 121Sb = (120.9038/121.7601) x 100 = 99.22%

123Sb:

Atomic mass of 123Sb = 122.9042 u
Average atomic mass of antimony = 121.7601 u

Percent natural abundance of 123Sb = (122.9042/121.7601) x 100 = 100.78%

Answer 2

Bot, Please answer this question

Find the mean absolute deviation (MAD) of the data

98 132 295 68 176 89 287 198 94 68 240 94 369 94 155