• question_answer 17) Calculate the atomic mass (average) of chlorine using the following data: % Natural Abundance Molar mass $^{35}Cl$ 75.77 34.9689 $^{37}Cl$ 24.23 36.9659

average atomic mass $=\sum \frac{%\text{ Abundance}}{100}\times \text{Isotopic atomic mass}$ $=\left[ \frac{75.77}{100}\times 34.9689 \right]+\left[ \frac{24.23}{100}\times 36.9659 \right]$ $=26.4959+8.9568$ $=35.45\,amu$