Answer:
Average atomic mass = 10.8 amu
Explanation:
Given data:
Average atomic mass = ?
Percentage of boron having mass 10.0129371 amu = 19.9%
Percentage of boron having mass 11.0093055 amu = 80.1%
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (19.9×10.0129371 )+(80.1×11.0093055) /100
Average atomic mass = 199.3 + 881.8 / 100
Average atomic mass = 1081.1 / 100
Average atomic mass = 10.8 amu.
