Question

If 31.8 grams of LiCl are dissolved in 225 grams of water, what is the concentration of the solution in percent by mass? 

Answer 1

(31.8/(225+31.8))(100)=12.38317757% LiCl

Answer 2

Answer: 12.4 %

Explanation:

To calculate the mass percent of solution, we use the formula:

$\text{Mass percent of solution}=\frac{\text{Mass of solute}}{\text{mass of solution}}\times 100$

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

$\text{Mass percent of solution}=\frac{31.8}{256.8g}\times 100=12.4%$

Thus concentration of the solution in percent by mass is 12.4%