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Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion. 4al(s) + 3o2(g) ® 2al2o3(s) using the thermodynamic data provided below, calculate ds° for this reaction.

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Chlidonias

The given equation representing the reaction of Aluminum with oxygen to form aluminum oxide is:

[tex] 4 Al(s) + 3 O_{2}(g) ---> 2 Al_{2}O_{3} (s) [/tex]

Δ[tex] S^{0}_{reaction} [/tex] = ΣnΔ[tex] S^{0}(products) -[/tex]Δ∑n[tex] S^{0}(reactants) [/tex]

= {2*51 J/(K.mol)} - {(4* 28 J/(mol.K)) + (3 * 205 J/(mol.K)}

= -625 J/(mol.K)

Therefore, the delta S for the reaction is -625 J/(mol.K)

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