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AP Chemistry/Unit 9: Applications of Thermodynamics
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Activation Energy and Spontaneity

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The combustion of glucose (C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O) is a highly exergonic reaction with ΔG° = -2880 kJ/mol. Which of the following best explains why this thermodynamically spontaneous reaction does not proceed at a measurable rate at room temperature?

A

Endothermic nature of the overall reaction

B

High activation energy requiring an initial input of energy

C

Positive entropy change opposing the reaction

D

Equilibrium constant less than 1

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