Chapter SH, Problem 16.6APP

To determine

To calculate: Average atomic mass of magnesium.

Answer to Problem 16.6APP

Average atomic mass of magnesium is 24.3 g .

Explanation of Solution

Given:

Percentage of magnesium-24 = $80\%$

Percentage of magnesium-25 = $10\%$

Percentage of magnesium-26 = $10\%$

Calculation:

Average atomic mass is calculated as:

  $\begin{array}{c}80\%\text{ of 24}+10\%\text{ of 25}+10\%\text{ of 26}=\text{0}\text{.8}\times \text{24}+0.1\times 25+0.1\times 26\\ =19.2+2.5+2.6\\ =24.3\end{array}$

Conclusion:

Average atomic mass of magnesium is 24.3 g.