The mass of carbon anode consumed (giving onl | vedclass

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Question

(D) The chemical reaction at the anode is: $C(s) + 2O^{2-} \rightarrow CO_2(g) + 4e^-$. The reaction for the production of aluminium is: $Al^{3+} + 3e

Vedclass · Accepted Answer

$90$

Vedclass · Answer

(D) The chemical reaction at the anode is: $C(s) + 2O^{2-} ightarrow CO_2(g) + 4e^-$. The reaction for the production of aluminium is: $Al^{3+} + 3e^- ightarrow Al(s)$. According to Faraday's laws of electrolysis,the number of equivalents of $Al$ produced must equal the number of equivalents of $C$ consumed. The equivalent weight of $Al$ is $E_{Al} = \frac{27}{3} = 9$. The equivalent weight of $C$ is $E_C = \frac{12}{4} = 3$. Using the relation $\frac{w_{Al}}{E_{Al}} = \frac{w_C}{E_C}$: $\frac{270}{9} = \frac{w_C}{3}$. $w_C = \frac{270 	imes 3}{9} = 90 \ kg$.

The mass of carbon anode consumed (giving only carbon dioxide) in the production of $270 \ kg$ of aluminium metal from bauxite by the Hall process is ............... $kg$.

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