# What is the percent by mass of a solution that contains 45.0 g #"KNO"_3# in 295 mL water?

##### 1 Answer

Jun 18, 2017

The solution is 13.3 %

#### Explanation:

The formula for percent by mass is

#color(blue)(bar(ul(|color(white)(a/a)"% by mass" = "mass of component"/"total mass" × 100 %color(white)(a/a)|)))" "#

We know the mass of the

**Calculate the mass of the water**

Now we can calculate the percent by mass.