Question

The table given below is showing information about the isotopes of chlorine. Calculate the average atomic mass of chlorine using the given data.​ [2 marks]
\begin{tabular}{|c|c|c|} \hline Isotope & Atomic Mass & \% Abundance \\ \hline Chlorine \( -35 \) & \( 34.96 u \) & 75 \\ \hline Chlorine \( -37 \) & \( 36.96 u \) & 25 \\ \hline \end{tabular}

Answer 1

Average atomic mass = $\frac{\sum (Atomicmassofisotopesofelement\times abundance)}{100}$ [1 mark]

$=\frac{34.96\times 75+36.96\times 25}{100}=35.5$ [1 mark]