SOLUTION:
Step 1: List the given values.
[tex]\begin{aligned} & mass_{\text{solute}} = \text{11 g} \\ & mass_{\text{solution}} = \text{80 g} \end{aligned}[/tex]
Step 2: Calculate the percent by mass.
[tex]\begin{aligned} \%(m/m) & = \frac{mass_{\text{solute}}}{mass_{\text{solution}}} \times 100\% \\ & = \frac{\text{11 g}}{\text{80 g}} \times 100\% \\ & = \boxed{13.75\%} \end{aligned}[/tex]
Hence, the percentage by mass of a salt solution is 13.75%.
[tex]\\[/tex]
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