Please help me with C-4 sum correct answer is -1.14 volt

C-4 . Using the $∆G^o$ for the reactions
C + O₂ $\to$CO₂ $∆G^o$= - 395 kJ / mole
2Al (l) + 3/2O₂ $\to$Al₂O₃ (s) $∆G^o$ = -1269 kJ / mole
Al₂O₃ (s) $\to$Al₂O₃ (melt)  $∆G^o$ = 16 kJ/mole
Calculate the EMF for the cell reaction
2Al₂O₃ (melt) + 3C $\to$4Al (l) + 3CO₂ (g) 
The number of electrons involved in the reaction is 12.