Aluminum Forms a Layer of Aluminum Oxide When Exposed to Air

question 83

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) $\rarr$ 2Al₂O₃(s) Using the thermodynamic data provided below, calculate $\Delta$ S ^$\circ$ for this reaction. $\begin{array}{|l|c|}\hline & \mathrm{S}^{\circ}(\mathrm{J} / \mathrm{K} \cdot \mathrm{~mol}) \\\hline \mathrm{Al}(s) & 28.3 \\\hline \mathrm{O}_{2}(g) & 205.0 \\\hline \mathrm{Al}_{2} \mathrm{O}_{3}(s) & 50.99 \\\hline\end{array}$

• 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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