We are asked to calculate for the **mass percent (mass %) of Cl **in **HCl. **

**T**o do that we’re going to use the **mass percent formula **shown below:

$\overline{){\mathbf{mass}}{\mathbf{\%}}{\mathbf{}}{\mathbf{Cl}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{Cl}}{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{HCl}}{\mathbf{}}{\mathbf{x}}{\mathbf{}}{\mathbf{100}}{\mathbf{\%}}}$

First, we need to get the molar mass of **HCl.**

**Molar mass of HCl:**

**HCl**** 1 **

** 1 **

What is the mass percent of chlorine in hydrochloric acid?

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