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9. The resction between aluminlum and ferrie wean generate temperatares up to 3273 K sused in welding metals. (Atomle mass of Al-Atomie mass of O 16 s)process, J24 g of ลา。minium is allowed towith 1.12 kg of ferric oside.i) Caleulate the mass of AL,O, formedil) How much of the eseess reagent is left stend of the reaction?

Answer»

Molecular mass of the Ferric oxide = 160 g/mol.Molecular mass of the Aluminium Oxide = 102 g/mol.

Reaction is⇒2Al + Fe₂O₃ ----------→ Al₂O₃ + 3Fe.

(i). 54 g of the Al produces 102 g of the Aluminium Oxide.∴1 g of the Al produces 102/54 g of the Aluminium Oxide.∴ 324 grams of the Al produces (102/54)× 324 g of the Aluminium Oxide.= 612 grams.

Hence, the mass of the Aluminium Oxide is 62 grams.

(ii). 2× 27 grams of the aluminum reacts with the 160 grams of the Ferric Oxide.∴ 1 grams of the Al reacts with the 160/54 g of the Ferric Oxide.∴ 324 grams of the Al reacts with the (160/54)× 324 g = 960 g of the Ferric Oxide.

Now, Whole mass of the Ferric Oxide present will not be consumed since it is in excess & Aluminium is the limiting reactant.

∴ Mass of the Ferric Oxide left = 1120 - 960= 160 g.

Hence, the mass of the Ferric oxide left unreacted will be 160 g.


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