# Question #4e511

##### 1 Answer

You need **8 g** of sodium chloride to make that solution.

#### Explanation:

A solution's molarity is defined as the number of moles of solute, in your case sodium chloride, divided by the volume of the solution - expressed in **liters**.

Since you know what the volume and the molarity of the target solution have to be, you can determine how many moles of sodium chloride you'd need by

Notice that I converted the volume from mL to L. In addition to that, I used the fact that

Now use sodium chloride's molar mass, which tells you what the mass of *1 mole* of sodium chloride is, to determine how many grams would contain that many moles.

Rounded to one sig fig, the number of sig figs you gave for the volume and molarity of the solution, the answer will be

So, in order to make this solution, you add **8 g** of *enough water* to make the final volume equal to **700 mL**.