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Chlorine exists in two isotopes $_{17}^{37} Cl$ and $_{17}^{35} C$ . If the percentage abundance of $^{37} Cl$ is 25 % and $^{35} Cl$ is 25% then average isotopic mass of chlorine is _________

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35.5

answer is D.

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Detailed Solution

Average isotopic mass = $\frac{{Atomic weight}_{1} {X%}_{1} + {Atomic weight}_{2} {X%}_{2}}{100}$

$= \frac{37 \times 25 + 35 \times 75}{100} = 35.5$

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