In an organic synthesis reaction between $Li$ and methyl chloride $(C{H}_{3}Cl)$ methyl$-$lithium is

formed. What is the yield of the reaction if $13\mathrm{.}9g$ of Li produce $2\mathrm{.}20g$ of methyl$-$lithium:

$2Li(s)+C{H}_{3}Cl(I)$LiCl$(s)+C{H}_{3}Li(l)$