Question

The Formula unit mass of magnesium chloride is __________

Answer 1

Step1. Formula unit mass:

• “The formula unit mass of a substance is a sum of the atomic masses of all atoms in a formula unit of a compound.”

Step2. Formula unit mass of magnesium chloride

$$\begin{gathered} {\text{Formula unit mass of MgCl}}_{\text{2}}=\text{Atomic mass of Mg+2×Atomic mass of Cl} \\ =24.31\text{u}+2\times 35.5\text{u} \\ =95.31\text{u} \end{gathered}$$

Hence, the Formula unit mass of magnesium chloride is $95.31\text{u}$.