\textbf{215-} If 0.5 moles of aluminum sulfate are decomposed, producing 28.8 liters of gas at conditions where the molar volume of gases is 24 liters, what is the percent yield of the reaction and how many grams of solid product are obtained?
$(S = 32,\ Al = 27,\ O = 16\ \text{g.mol}^{-1})$
(1) $40.8 \cdot \Lambda\circ$ \hfill (2) $\Delta\circ/1 \cdot \Lambda\circ$ \hfill (3) $40.8 \cdot \Lambda\Delta$ \hfill (4) $\Delta\circ/1 \cdot \Lambda\Delta$