MCQ
Assuming chlorine element has two isotopes as $Cl^{35}$ and $Cl^{37}$ with their percentage abundance as $25\%$ and $75\%$ respectively. Find the average atomic weight
- A$35.5$
- B$40$
- ✓$36.5$
- D$38.5$
✓
Answer
Correct option: C.
$36.5$
c
Avg. atomic mass $= \frac {m_1x_1\,\,+\,\,m_2x_2}{x_1\,\,+\,\,x_2}$
Avg. atomic mass $= \frac {m_1x_1\,\,+\,\,m_2x_2}{x_1\,\,+\,\,x_2}$
$=\frac {35\times 25 +37\times 75}{25+75}$
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