Answer: 12.4 %
Explanation:
To calculate the mass percent of solution, we use the formula:
[tex]\text{Mass percent of solution}=\frac{\text{Mass of solute}}{\text{mass of solution}}\times 100[/tex]
Given :
mass of solute (LiCl) = 31.8 grams
mass of solvent (water) = 225 grams
Mass of solution = mass of solute + mass of solvent = 31.8 g + 225 g= 256.8 g
[tex]\text{Mass percent of solution}=\frac{31.8}{256.8g}\times 100=12.4%[/tex]
Thus concentration of the solution in percent by mass is 12.4%
