# What is the percent by mass of KBr if 58.2 grams are dissolved in 344 grams of water?

##### 2 Answers

#### Explanation:

The idea here is that you need to determine how many grams of potassium bromide will be present for every **percent concentration by mass** represents.

If you dissolve **total mass** of the solution will be

#"58.2 g + 344 g = 402.2 g"#

So this solution contains

#100. color(red)(cancel(color(black)("g solution"))) * "58.2 g KBr"/(402.2 color(red)(cancel(color(black)("g solution")))) = "14.5 g KBr"#

You can thus say that the solution's **percent concentration by mass** is equal to

#color(darkgreen)(ul(color(black)("% m/m = 14.5% KBr")))#

The answer is rounded to three **sig figs**, the number of sig figs you have for your figures.

The percent by mass of

#### Explanation:

The mass of the solution is the mass of the solute and solvent.

The given mass of the solute

The mass of the solution is

Plug in the known values and solve.