Question

Find the ratio by mass of the combining elements in ${\mathrm{MgCl}}_2$

Answer 1

As we Know

Atomic mass of $$\begin{gathered} \mathrm{Mg}=24 \\ \mathrm{Cl}=35.5 \end{gathered}$$

So Ratio by mass of ${\mathrm{MgCl}}_2$ =$$\begin{gathered} Mg:Cl\times 2 \\ 24:35.5\times 2 \\ 24:71 \end{gathered}$$

Hence the ratio by mass of ${\mathrm{MgCl}}_2$=24:71