# What is the formula mass of methylene chloride CH_4Cl_2?

The formula mass of methylene chloride is $84.93$ $g \cdot m o {l}^{-} 1$.
Methylene chloride has a formula of $C {H}_{2} C {l}_{2}$; it is a commonly used solvent, and is immiscible with water. Because it is denser than water, it conveniently forms the bottom layer of a solvent extraction. If you get some of the stuff on the webbing beween your fingers it stings like buggery.