What is average atomic mass of chlorine if its two isotopes Cl 35 and Cl 37 exists in relative abundance of 75% and 25% respectively ?

Question

TestHub · Accepted Answer

Average atomic mass is calculated using the formula:

Average atomic mass = $\frac{m _{1} \times p _{1} + m _{2} \times p _{2}}{100}$

where $m_{1}$ and $m_{2}$ are the atomic masses of the isotopes, and $p_{1}$ and $p_{2}$ are their respective percentage abundances.

Substituting the given values:

Average atomic mass = $\frac{35 \times 75 + 37 \times 25}{100}$

Average atomic mass = $\frac{2625 + 925}{100}$

Average atomic mass = $\frac{3550}{100} = 35.5$

Answer: $35.5$

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