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AP Chemistry/Unit 9: Applications of Thermodynamics
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Calculating Standard Entropy Change

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Using the standard molar entropies in the table, what is the standard entropy change, ΔS∘\Delta S^\circ, in J/(mol*K) for the reaction shown below?

\ce2NO(g)+O2(g)−>2NO2(g)\ce{2 NO(g) + O2(g) -> 2 NO2(g)}

Species S° (J/mol*K)
NO(g) 210
O2(g) 205
NO2(g) 240
A

−200-200

B

+145+145

C

−145-145

D

+200+200

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