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AP Chemistry/Unit 6: Thermodynamics
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Spontaneity Enthalpy And Entropy
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A student performs four reactions in identical calorimeters and measures the temperature change in each. Which reaction is LEAST likely to be spontaneous at standard conditions?

A

Reaction that increases temperature by 12°C with ΔS = -25 J/(mol·K)

B

Reaction that increases temperature by 5°C with ΔS = +10 J/(mol·K)

C

Reaction that decreases temperature by 8°C with ΔS = +60 J/(mol·K)

D

Reaction that decreases temperature by 15°C with ΔS = -45 J/(mol·K)

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