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AP Chemistry/Unit 9: Applications of Thermodynamics
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Standard Reaction Entropy Calculation

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For the reaction 2H₂(g) + O₂(g) → 2H₂O(g), what is the standard entropy change, ΔSrxno\Delta S^\text{o}_{\text{rxn}}, given the following standard absolute entropies? So(H2)=130.7 J/(mol⋅K)S^\text{o}(\text{H}_2) = 130.7\ \text{J}/(\text{mol} \cdot \text{K}), So(O2)=205.1 J/(mol⋅K)S^\text{o}(\text{O}_2) = 205.1\ \text{J}/(\text{mol} \cdot \text{K}), and So(H2O(g))=188.8 J/(mol⋅K)S^\text{o}(\text{H}_2\text{O(g)}) = 188.8\ \text{J}/(\text{mol} \cdot \text{K})

A

-44.9 J/K

B

+89.7 J/K

C

-89.7 J/K

D

-466.5 J/K

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