Question

chlorine occurs in nature in two isotopic forms of the 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 of an element = mass of atom 1 × its percentage + mass of atom 2× its percentage
→ The average atomic mass of Cl = 35×75/100+37×25/100g
105/4 + 37/4 g
(105+37)/4g
35.5g