# What is the mass percent (m/m) concentration of a solution of 10.0 g of sodium chloride in 100 g of solution?

Jun 28, 2016

10%

#### Explanation:

A solution's mass percent concentration, $\text{% m/m}$, is calculated by looking at how many grams of solute you get per $\text{100 g}$ of solution.

$\textcolor{b l u e}{| \overline{\underline{\textcolor{w h i t e}{\frac{a}{a}} \text{% m/m" = "grams of solute"/"100 g of solution} \times 100 \textcolor{w h i t e}{\frac{a}{a}} |}}}$

Simply put, the solution's mass percent concentration is given by the number of parts of solute you get in $100$ parts of solution, which is made up of solute and solvent.

So, if $\text{100 g}$ of a given solution contains $\text{1 g}$ of solute, that solution will have a $\text{1% m/m}$ concentration.

In your case, the solution is said to contain $\text{10.0g}$ of solute in $\text{100 g}$ of solution, which means that its mass percent concentration will be

"% m/m" = color(green)(|bar(ul(color(white)(a/a)color(black)(10 %)color(white)(a/a)|)))

So, every time a problem wants you to figure out a solution's mass percent concentration, focus on determining how many grams of solute you per in $\text{100 g}$ of solution.