1. Percent by Mass of a Solution

2. (Mass solute + Mass solvent)
% by Mass
Another way of referring to concentration
Basically % composition of a solution
Key info: The density of water is handy!
Every 1mL = 1gram of H2O
% Mass =
Mass of solute
(Mass solute + Mass solvent)
X 100

3. % Mass Practice
If 31 grams of ammonium bromide are dissolved to make a 287 gram solution, what is the % by mass of the solute?
If a 64 gram solution is 5.2% sodium acetate, how many grams of solute are inside?

4. % Mass Practice Round 2
1.940 grams of potassium nitrate are dissolved in mL of water. What is the % Mass?
0.243 moles of sodium chloride are dissolved into 250mL of water. What is the % Mass?