Mass percent (%m/m) is calculated by working out the mass of solute in grams per of the solution in grams:
[tex]\begin{gathered} mass\text{ }percent=\frac{mass\text{ }of\text{ }solute}{mass\text{ }of\text{ }solution}\times100 \\ 17.9\%=\frac{x}{546\text{ }g}\times100 \\ \\ 0.179=\frac{x}{546g} \\ x=0.179\times546g \\ x=97.7g \end{gathered}[/tex]Answer: 97.7g of BaCl2 is needed.
