18 grams of Aluminium is heated with 8 grams of Oxygen to form Alumina. The weight of excess reagent left is

GEW of Al = 9 gGEW of O2= 8 g;8 grams of Oxygen require 9 grams of Al.Weight of Al left = 9 g ;Alternate method:4Al4×27 g  +   3O23×32 g  →   2Al2O3           X g                           8 g X= 8×4×273×32=9 g ; Weight of excess Al =18-9 g=9 g ;