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Stoichiometry and Stoichiometric Calculations

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 g

GEW 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 ; 

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