On the basis of the information available fro | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The reaction for the electrolysis of $Al_2O_3$ is the reverse of the formation reaction: $\frac{2}{3} Al_2O_3 	o \frac{4}{3} Al + O_2$.For this r

Vedclass · Accepted Answer

$2.14$

Vedclass · Answer

(B) The reaction for the electrolysis of $Al_2O_3$ is the reverse of the formation reaction: $\frac{2}{3} Al_2O_3 	o \frac{4}{3} Al + O_2$.For this reaction,$\Delta G = +827 \ kJ \ mol^{-1} = 827000 \ J \ mol^{-1}$.The number of electrons involved in the reaction is calculated from the oxidation state change: $Al^{3+} + 3e^- 	o Al$. Since there are $\frac{4}{3}$ moles of $Al$,the total electrons $n = \frac{4}{3} 	imes 3 = 4$.Using the formula $\Delta G = -nFE$,the minimum emf $E$ required is $E = -\frac{\Delta G}{nF}$.$E = -\frac{827000 \ J \ mol^{-1}}{4 	imes 96500 \ C \ mol^{-1}} = -2.14 \ V$.Since we are looking for the minimum external potential to drive the non-spontaneous reaction,the magnitude is $2.14 \ V$.

On the basis of the information available from the reaction $\frac{4}{3} Al + O_2 \to \frac{2}{3} Al_2O_3$,$\Delta G = -827 \ kJ \ mol^{-1}$ of $O_2$,the minimum emf required to carry out an electrolysis of $Al_2O_3$ is $............... \ V$

Similar Questions

Explain the different conditions when an external potential is applied in the opposite direction in a galvanic cell (Voltaic cell) by taking a suitable cell example.

The position of some metals in the electrochemical series in decreasing electropositive character is given as $Mg > Al > Zn > Cu > Ag$. What will happen if a copper spoon is used to stir a solution of aluminium nitrate?

The cell reaction of the galvanic cell $Cu_{(s)} | Cu^{2+}_{(aq)} || Hg^{2+}_{(aq)} | Hg_{(l)}$ is

Depict the galvanic cell in which the reaction $Zn_{(s)} + 2Ag_{(aq)}^{+} \to Zn_{(aq)}^{2+} + 2Ag_{(s)}$ takes place. Further show:
$(i)$ Which electrode is negatively charged?
$(ii)$ The carriers of the current in the cell.
$(iii)$ Individual reaction at each electrode.

The reference electrode,specifically the Saturated Calomel Electrode $(SCE)$,is made from which of the following substances?

Vedclass Test Series

Exam Paper Generator

Online Exam Module