Given:
m1 = 120.9038 amu
m2 = 122.9042 amu
m = 121.7601 amu
use:
atomic mass = sum of (mass of isotope * abundance) / 100
m = (m1*A1 + m2*A2)/100
121.7601 = ( 120.9038*A1 + 122.9042*(100-A1))/100
121.7601 = ( 120.9038*A1 + 12290.42- 122.9042*A1))/100
A1 = 57.19 %
A2 = 100 - A1
= 100 - 57.19
= 42.81 %
Answer:
57.19 %
42.81 %
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