First slide

Stoichiometry and Stoichiometric Calculations

Question

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

Moderate

A

9 grams of Aluminium
B

4.16 grams of Oxygen
C

10.08 grams of Oxygen
D

4.5 grams of Aluminium

Solution

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:
$4 Al (4 \times 27 g) + 3 O_{2} (3 \times 32 g) \to 2 {Al}_{2} O_{3} X g 8 g X = \frac{8 \times 4 \times 27}{3 \times 32} = 9 g; Weight of excess Al = (18 - 9) g = 9 g;$

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