Aluminum Forms a Layer of Aluminum Oxide When Exposed to Air

question 64

Multiple Choice

Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion. 4Al(s) + 3O₂(g) $\to$ 2Al₂O₃(s)
Using the thermodynamic data provided below, calculate $\Delta$ S° for this reaction.

• A)182.3 J/K·mol
• B)131.5 J/K·mol
• C)-182.3 J/K·mol
• D)-626.2 J/K·mol
• E)-802.9 J/K·mol

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