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Q.

When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is ____. (Nearest integer)
Given :
Molar mass of Al is 27.0 g mol–1
Molar mass of O is 16.0 g mol–1

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answer is 153.

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Detailed Solution

4Al+3O2⟶2Al2O38127=3 mole         12832=4mole

Limiting reagent

∴ mole of Al2O3 formed =12×3 mole  ∴ wt. of Al2O3 formed =32×102 = 153 gm

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