Question

13. Chlorine has 2 isotopes with mass 35u and 37u. If relative abundance of them
are 75% and 25% respectively calculate it average atomic mass.​

Answer 1

Explanation:

Average Atomic Mass =

$= \frac{35 \times 75 + 37 \times 25}{75 + 25}$

$= \frac{2625 + 925}{100} = \frac{3550}{100} = 35.5 \: u$

Hence , the average atomic mass of chlorine is 35.5 u.

I hope it helps you. If you have any doubts, then don't hesitate to ask.