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A solution is prepared by dissolving 31.7 g kno3 in 100.0 grams water at 20 degrees celsius. the density of pure water and solution at this temperature is 0.998 g/ml and 1.17 g/ml respectively. compute for the % by mass of solution

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SOLUTION:

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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