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Smelting

the mass of c...

Question

the mass of carbon anode consumed (giving only carbon dioxide) in the production of $270 K g$ of aluminium metal from bauxite by the Hall's process is:
$2 A l_{2} O_{3} + 3 C \to 4 A l + 3 C O_{2}$

A

180 K g

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B

270 K g

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C

240 K g

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D

90 K g

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Solution

The correct option is D $90 K g$
$2 A l_{2} O_{3} + 3 C ⟶ 4 A l + 3 C O_{2}$
The mass of carbon consumed $= \frac{3 \times 12 \times 270}{4 \times 27} = 90 k g$

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