# How many grams of potassium chloride are in 45.0 g of a 5.00% (by mass) solution?

##### 1 Answer

#### Explanation:

A solution's **percent concentration by mass**, *grams of solute*, which in your case is potassium chloride, **per** **of solution**.

You're dealing with a **for every** **of solution**.

So, if

#45.0 color(red)(cancel(color(black)("g solution"))) * overbrace("5.00 g KCl"/(100color(red)(cancel(color(black)("g solution")))))^(color(purple)("= 5.00% m/m")) = color(green)(|bar(ul(color(white)(a/a)"2.25 g"color(white)(a/a)|)))#

The answer is rounded to three **sig figs**.