Question

chlorine occurs in nature in two isotopic forms if abundance of
1.) ^35Cl is 75%
17
and that of
2.) ^37Cl is 25%
17
calculate the average atomic mass of chlorine
for class 9th chemistry chapter structure of the atoms

Answer 1

average atomic mass= 35+37=72÷2=36

Answer 2

average atomic mass of chlorine = (35×75+37×25)/100

average atomic mass of chlorine = 3550/100

average atomic mass of chlorine= 35.50 gm