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Step 1: List the given values.
[tex]\begin{aligned} & mass_{\text{solute}} = \text{31.7 g} \\ & mass_{\text{solvent}} = \text{100.0 g} \end{aligned}[/tex]
Step 2: Calculate the percent by mass.
[tex]\begin{aligned} \%(m/m) & = \frac{mass_{\text{solute}}}{mass_{\text{solute}} + mass_{\text{solvent}}} \times 100\% \\ & = \frac{\text{31.7 g}}{\text{31.7 g + 100.0 g}} \times 100\% \\ & = \boxed{24.1\%} \end{aligned}[/tex]
Hence, the % by mass of solution is 24.1%.
[tex]\\[/tex]
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