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Question Q158) 1 mol of KClO3 is thermally decomposed and excess of aluminium is burnt in the gaseous product. How many moles of Al2O3 are formed?



SOLUTION

Thermal decomposition of KClO3
2KClO3 → 2KCl +3O2
Thus Two moles of KClO3 produces Three moles of oxygen
1 mole of KClO3 will produce 1.5moleof Oxygen
Now when Al burn 4Al +3O2 → 2Al2O3
Al is in excess thus oxygen is limiting reagent
Now 3 moles of Oxygen produce 2 moles of Al2O3
× 1.5 moles of Oxygen produce 1 mole of Al2O3
Answer : (a)