# How can I convert percent concentration to molarity?

##### 1 Answer

Here's one way to do it.

#### Explanation:

**Example**

Concentrated hydrochloric acid is usually available at a concentration of 37.7% by mass. The density of the solution is 1.19 g/mL. What is its molar concentration?

**Solution**

**Step 1. Calculate the mass of 1 L of solution.**

**Step 2. Calculate the mass of #"HCl"#.**

**Step 3. Calculate the moles of #"HCl"#.**

**Step 4.** Calculate the molarity of the HCl.

Here's a summary of the types of calculations we were using above

And here's a video about converting mass % to molarity.