# Question #07095

##### 1 Answer

#### Explanation:

A solution's **percent concentration by mass**, or *grams of solute* you get for every **of solution**.

In your case, an ammonia solution that is **for every** **of solution**.

This means that you can essentially use the solution's percent concentration as a *conversion factor* to help you go from grams of solute to grams of solution or vice versa.

In your case,

#135 color(red)(cancel(color(black)("g solution"))) * overbrace("12.5 g NH"_3/(100color(red)(cancel(color(black)("g solution")))))^(color(purple)("= 12.5% m/m")) = color(green)(|bar(ul(color(white)(a/a)"16.9 g NH"_3color(white)(a/a)|)))#

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

Now, you can use the exact same approach to find the volume of fruit juice present in

This time, you're dealing with **percent concentration by volume**, or *volume of solute* that you get **for every** **of solution**.

Use this concentration as a conversion factor to get the answer. You should end up with