# How many moles of S are in 2 moles of Al_2S_3?

The chemical formula specified the ratio of constituent atoms in the compound. We were given $A {l}_{2} {S}_{3}$; in one mole of this stuff there are 2 moles of aluminum, approx. $54$ $g$ of metal.
In 2 moles of $A {l}_{2} {S}_{3}$, what is the mass of aluminum?