Electrolytic cells containing Zn and Al salt | vedclass

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(D) According to Faraday's second law of electrolysis,when the same quantity of electricity is passed through cells connected in series,the mass of su

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$1.8$

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(D) According to Faraday's second law of electrolysis,when the same quantity of electricity is passed through cells connected in series,the mass of substances deposited is proportional to their equivalent masses.$W_{Zn} / E_{Zn} = W_{Al} / E_{Al}$Equivalent mass $E = 	ext{Molar mass} / n$-factor.For $Zn^{2+} + 2e^{-} \longrightarrow Zn$,$n$-factor $= 2$.$E_{Zn} = 65 / 2 = 32.5 \ g \ mol^{-1}$.For $Al^{3+} + 3e^{-} \longrightarrow Al$,$n$-factor $= 3$.$E_{Al} = 27 / 3 = 9 \ g \ mol^{-1}$.Substituting the values:$6.5 / 32.5 = W_{Al} / 9$$0.2 = W_{Al} / 9$$W_{Al} = 0.2 	imes 9 = 1.8 \ g$.

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