Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion.4Al(s) + 3O₂(g) $\rarr$ 2Al₂O₃(s) Calculate $\Delta$G^$\circ$ for this reaction, given that $\Delta$G^$\circ$_f of aluminum oxide is -1576.4 kJ/mol. A) -3152.8 kJ/mol B) -1576.4 kJ/mol C) -788.2 kJ/mol D) 1576.4 kJ/mol E) 3152.8 kJ/mol

Question

Quizplus · Accepted Answer

The formation of 2 moles of aluminum oxide from aluminum and oxygen has a ΔG°f of -1576.4 kJ/mol per mole of aluminum oxide. Since the reaction produces 2 moles, the total ΔG° for the reaction is 2 * -1576.4 kJ/mol = -3152.8 kJ/mol.

Aluminum Forms a Layer of Aluminum Oxide When Exposed to Air