Answer:
Atomic mass = 27 amu
Explanation:
Given data:
Atomic mass of element X= ?
Abundance of X-28 = 75%
Abundance of X-24 = 100 - 75 = 25%
Atomic mass of X-28 = 28 amu
Atomic mass of X-24 = 24 amu
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (75×28)+(25×24) /100
Average atomic mass = 2100 + 600 / 100
Average atomic mass = 2700 / 100
Average atomic mass = 27 amu.
