# What are some examples of percent concentration?

##### 1 Answer

Here are three examples of percent concentration.

**PERCENT BY MASS (m/m)**

Percent by mass (m/m) is the mass of solute divided by the total mass of the solution, multiplied by 100 %.

Percent by mass =

**EXAMPLE**

What is the percent by mass of rubbing alcohol in a solution that contains 275 g of rubbing alcohol in 500 g of solution?

**Solution**

Percent by mass =

55.0 % (m/m)

**PERCENT BY MASS OVER VOLUME (m/v)**

Percent (m/v) is the mass of solute divided by the volume of the solution, multiplied by 100 %.

Percent (m/v) =

**EXAMPLE**

If the density of the above solution is 0.857 g/mL, what is the percent (m/v) of rubbing alcohol?

**Solution**

Volume of solution = 500 g solution ×

(3 significant figures + 1 guard digit)

Percent (m/v) =

**PERCENT BY VOLUME (v/v)**

Percent by volume (v/v) is the volume of solute divided by the total volume of the solution, multiplied by 100 %.

Percent by volume =

**EXAMPLE**

What is the percent by volume in a solution that contains 350 mL of rubbing alcohol 500 mL of solution?

**Solution**

Percent by volume =