Question

When 8.2 grams of LiBr are dissolved in enough water to create a 150-gram solution, what is the solution's concentration, expressed as a percent by mass?

Answer 1

5.46% is the percent by mass concentration of the solution.

Step-by-step explanation:

Mass of LiBr= 8.2 g(Solute)

Mass of solution = 150 g (Solution)

Mass of solution = Mass of solute + Mass of solvent

Mass of solute < Mass of solvent (Always)

Mass of water = 150 g - 8.2 g = 141.8 g (solvent)

Mass percentage is given as:

`\frac{\text{mass of solute}}{\text{mass of solution}}* 100`

`Mass\%=(8.2 g)/(150 g)* 100=5.46\%`

5.46% is the percent by mass concentration of the solution.