Question

calculate the average atomic mass of chlorine with following data . mass no 35.and ℅ abundance 75 ℅

Answer 1

Chlorine occurs in nature in two isotopic forms, with masses 35u and 37u in the ratio of 3:1.

The average atomic mass of chlorine atom, on the basis of above data, will be

= [(35 × 75/100 + 37 × 25/100)]
= (105/4 + 37/4)
= 142/4
= 35.5 u