At 273 K, ΔG° for the reaction 2 C + O₂ → 2 CO
Is about -280 kJ, and at 1480 K is about -580 kJ. For the reaction
2 Zn + O₂ → 2 ZnO
ΔG° at 273 and 1480 K, respectively, is -640 and -280 kJ. Calculate ΔG° at 273 and 1480 K, respectively, for the reduction of zinc oxide by carbon.

Question

Quizplus · Accepted Answer

The reaction for the reduction of zinc oxide by carbon is: 2 ZnO + 2 C → 2 Zn + 2 CO. Using the given ΔG° values for the reactions, we calculate ΔG° for this reaction at 273 K as: (-280 kJ for CO formation) - (-640 kJ for ZnO formation) = +360 kJ. At 1480 K: (-580 kJ for CO formation) - (-280 kJ for ZnO formation) = -300 kJ.

At 273 K, ΔG° for the Reaction 2 C