Question

What is the entropy change associated with the following reaction? Al2O3(s) + 3 H2(g) → 2...

What is the entropy change associated with the following reaction?

Al2O3(s) + 3 H2(g) → 2 Al(s) + 3 H2O(g)

S° (J/mol∙K) 51.00 130.58   28.32   188.83

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Answer #1

we have:

Sof(Al2O3(s)) = 51.0 J/mol.K

Sof(H2(g)) = 130.58 J/mol.K

Sof(Al(s)) = 28.32 J/mol.K

Sof(H2O(g)) = 188.83 J/mol.K

we have the Balanced chemical equation as:

Al2O3(s) + 3 H2(g) ---> 2 Al(s) + 3 H2O(g)

deltaSo rxn = 2*Sof(Al(s)) + 3*Sof(H2O(g)) - 1*Sof( Al2O3(s)) - 3*Sof(H2(g))

deltaSo rxn = 2*(28.32) + 3*(188.83) - 1*(51.0) - 3*(130.58)

deltaSo rxn = 180.39 J/mol.K

Answer: 180.39 J/mol.K

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